Experimental device for verifying Ampere force law

Abstract

The utility model relates to an experimental device for verifying the Ampere force law, which comprises a direct-current power supply, a high-power resistor, two metal electrodes respectively serving as a positive electrode and a negative electrode, a bracket, a precise length measuring tool, two opposite magnets, a container filled with conductive liquid and a high-precision electronic scale, the direct-current power supply is used for providing a power supply in an experiment; the high-power resistor is used for limiting the maximum current in the circuit and preventing the circuit from being short-circuited due to over-low loop resistance; the two metal electrodes which are respectively used as a positive electrode and a negative electrode are used for providing current for the conductive liquid which is used as a current carrier and conducting the whole circuit; the metal electrode is electrically connected with the high-precision direct-current power supply and the high-power resistor; the two opposite magnets are used for providing a magnetic field; the container filled with the conducting liquid is used for containing the conducting liquid serving as a current carrier and bearing Ampere force borne by the conducting liquid in a magnetic field.

Description

Technical Field

[0001] The utility model belongs to the field of physical experiments, and particularly relates to an experimental device for verifying Ampere's law by using a conductive liquid. Background Art

[0002] The interaction between a magnetic field and an electric current is a basic phenomenon in electromagnetism. Ampere's force formula is one of the important physical laws describing this interaction. By exploring Ampere's force, we can deeply understand electromagnetic induction phenomena, understand the working principles of electromagnetic devices such as motors, and other electromagnetism contents. Currently, in mainstream middle school textbooks, the verification of Ampere's force only gives a qualitative experiment of observing the swing of a current-carrying metal rod between the two poles of a U-shaped magnet and the relationship between the swing amplitude and the magnitude of the applied current. Some improved quantitative measurement experimental devices are relatively complex and not very conducive to popularization and operation.

[0003] Therefore, the main purpose of this application is to design an experimental device and method for verifying Ampere's law with a simple structure, convenient operation, intuitive and quantitative measurement, and convenient data processing. Summary of the Utility Model

[0004] In view of the above problems, the utility model provides an experimental device for verifying Ampere's law with a simple structure, convenient operation, intuitive and quantitative measurement, and convenient data processing. The conductive liquid is cleverly used as a current carrier to measure the Ampere's force it receives in the magnetic field. The experimental device simplifies the connection and structure of the current loop, makes the system electronic and digital, is convenient for operation and control, intuitive and has high precision, and can verify Ampere's law by the method of controlling variables.

[0005] To achieve the above object, the utility model provides the following technical solutions: Provide an experimental device for verifying Ampere's law, the experimental device includes: a high-precision DC power supply, a high-power corrugated winding resistor, two metal electrodes respectively used as the positive and negative electrodes, a bracket, a precision length measurement tool, two opposite magnets, a container filled with a conductive liquid, a high-precision electronic scale, wherein, the high-precision DC power supply is used to provide power in the experiment, adjust the required current magnitude and read the current data, adjust parameters according to the circuit change, and keep the current output stable;

[0006] The high-power resistor is used to limit the maximum current in the circuit and prevent the circuit from short-circuiting due to too low loop resistance;

[0007] The two metal electrodes respectively used as the positive and negative electrodes are used to provide current for the conductive liquid as the current carrier and conduct the entire circuit;

[0008] The bracket is used to place the metal electrodes, and the metal electrodes are electrically connected to the high-precision DC power supply and the high-power resistor through wires;

[0009] The precision length measuring tool is used to measure the distance between two metal electrodes;

[0010] The two opposite magnets are used to provide a magnetic field;

[0011] The container filled with conductive liquid is used to hold the conductive liquid as a current carrier and withstand the Ampere force exerted on the conductive liquid in the magnetic field;

[0012] The high-precision electronic scale is used to measure the magnitude of the Ampere force exerted on the conductive liquid by measuring the change in the weight of the container filled with conductive liquid.

[0013] As a further improvement of the present application, the two magnets are placed on both sides of a slender strip-shaped groove provided at the top of the container. The length direction of the magnets is parallel to the slender strip-shaped groove, and the surface with the largest area of the magnets is kept parallel to but not in contact with the side surface of the container, so that the height of the center position of each magnet is consistent with the height of the conductive liquid in the slender strip-shaped groove.

[0014] As a further improvement of the present application, the two magnets are rectangular magnets with exactly the same magnetic field, and the length and width of the magnets should be greater than the length and width of the slender strip-shaped groove of the container, so that the magnetic field received by the conductive liquid is as uniform as possible.

[0015] As a further improvement of the present application, the conductive liquid is a highly saturated saline solution or a liquid metal.

[0016] As a further improvement of the present application, the liquid metal is a gallium-indium-tin alloy with a melting point lower than room temperature.

[0017] As a further improvement of the present application, the precision length measuring tool is a vernier caliper.

[0018] As a further improvement of the present application, the magnets are neodymium iron boron super magnets.

[0019] As a further improvement of the present application, the metal electrodes are made of copper metal wires.

[0020] As a further improvement of the present application, the high-precision DC power supply is a digital display high-precision constant current and constant voltage DC power supply.

[0021] As a further improvement of the present application, a structure parallel to the bottom surface is installed at the bottom of the bracket, and the structure can form a supporting surface to keep the bracket stable.

[0022] As a further improvement of the present application, a horizontal structure for placing the magnets is installed on the bracket to keep the magnets stable.

[0023] As a further improvement of the present application, a structure parallel to the bottom surface is installed on the bottom of the container, and the structure can form a supporting surface to keep the container stable.

[0024] The technical effects and advantages of the present application are as follows:

[0025] 1. The experimental device of this application has inexpensive and easily available equipment, simple structure and principle, convenient operation, accurate results, and is easy to promote.

[0026] 2. A quantitative verification device for Ampere's law is designed by cleverly using a conductive liquid as a current carrier. When using a low-melting-point liquid metal as the conductive liquid, stress-free good contact with the metal electrode can be achieved, and a large current can be used for the experiment. The experimental results have high precision, and at the same time, the connection and structure of the current loop are simplified.

[0027] 3. By adopting a digital display high-precision constant current and constant voltage DC power supply and a high-precision electronic scale, the experimental system is electronicized and digitized, and it is very convenient to adjust the current and directly read the data. The operation and control are convenient, intuitive and have high precision. The Ampere's law can be quantitatively verified by the control variable method, which is more conducive to grasping the Ampere's force law in learning.

[0028] 4. The experimental device of this application realizes the improvement from qualitative experiment to quantitative experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It shows the overall structural schematic diagram of the embodiment of the experimental device for verifying Ampere's law of the present invention.

[0031] Figure 2 It shows the partial structural schematic diagram of the embodiment of the experimental device for verifying Ampere's law of the present invention.

[0032] Figure 3 It shows the schematic diagram of fitting the relationship between Ampere's force and current, wire and magnetic field by a mathematical tool in the first embodiment of the experimental device for verifying Ampere's law of the present invention.

[0033] Figure 4 It shows the schematic diagram of fitting the relationship between Ampere's force and current, wire and magnetic field by a mathematical tool in the second embodiment of the experimental device for verifying Ampere's law of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0035] The present utility model provides an experimental device and an experimental method for verifying Ampere's law by using a conductive liquid as a current carrier. The objective of the embodiments of the present utility model is to intuitively observe and measure the force and motion of the conductive liquid in a magnetic field and analyze the factors affecting the direction and magnitude of the Ampere force by designing a reasonable experimental scheme. In the experiment of this embodiment, by changing conditions such as the current intensity and the conductive length, the change of the Ampere force is observed and recorded. Through data analysis, the relationship between the Ampere force, the current, the conductive length, and the magnetic field is explored to verify Ampere's law.

[0036] An experimental device for verifying Ampere's law provided by the utility model includes a container for containing a conductive liquid and the conductive liquid. A slender strip-shaped groove for containing the conductive liquid is provided at the top of the container. The experimental device further includes a high-precision electronic scale. The container is placed on the weighing platform of the high-precision electronic scale. The experimental device further includes a right-angled inverted U-shaped bracket (hereinafter referred to as the bracket). Two or more metal electrodes are placed on the top crossbeam of the bracket. A part of each metal electrode is perpendicular to the crossbeam and parallel downward. The metal electrode is not fixed to the crossbeam and can be adjusted in position along the crossbeam direction to achieve different settings of the metal electrode spacing. The bracket is placed above the container and the high-precision electronic scale, with the crossbeam of the bracket parallel to the slender strip-shaped groove of the container. At the same time, the bracket does not contact the container and the high-precision electronic scale, so that the metal electrode is immersed in the conductive liquid to form a circuit. The experimental device further includes an adjustable high-precision DC power supply and a high-power resistor. One end of the high-precision DC power supply is connected to one end of the high-power resistor through a soft metal wire. The other end of the high-power resistor is connected to the metal electrode on the crossbeam of the bracket through a soft metal wire, and is connected to another immersed metal electrode through the conductive liquid. The other immersed metal electrode is connected to the other end of the high-precision DC power supply through a soft metal wire to form a closed current circuit. The experimental device further includes two magnets. The magnets are placed on both sides of the slender strip-shaped groove at the top of the container. The length direction of the magnets is parallel to the slender strip-shaped groove. The largest surface of the magnets is parallel to the side of the container but does not contact it, so that the height of the center position of the magnets is the same as the height of the conductive liquid in the slender strip-shaped groove. The magnets can be placed on one side according to the test requirements, or one magnet can be placed on each side. When two magnets are placed, it is necessary to ensure that the distance between the slender strip-shaped groove and the two magnets is the same. The positions where the two energized metal electrodes are immersed in the conductive liquid should be adjusted to symmetrical positions with respect to the center point of the magnets to ensure as uniform a magnetic field as possible. The experimental device further includes a precision length measurement tool for measuring the metal electrode spacing. During the test, the current in the circuit can be adjusted to a stable output by the DC power supply and displayed on the display screen of the DC power supply. The force received by the conductive liquid container can be displayed by the high-precision electronic scale.

[0037] The conductive liquid uses a low-melting-point liquid metal.

[0038] A structure parallel to the bottom surface is installed at the bottom of the bracket. This structure can form a support surface to keep the bracket stable. A transverse structure for placing the magnets is installed on the bracket to keep the magnets stable.

[0039] A structure parallel to the bottom surface is installed at the bottom of the container. This structure can form a support surface to keep the container stable.

[0040] The length and width of the container do not exceed the length and width of the crossbeam of the bracket to prevent contact with each other when combined and placed.

[0041] The two magnets are identical rectangular magnets, and the length and width of the magnets should be greater than the length and width of the slender strip-shaped groove of the container, so that the magnetic field at the position where the conductive liquid is located during the test is as uniform as possible.

[0042] The high-precision DC power supply supports the constant current mode and digitally displays the current value, while the output voltage is less than the safe voltage to ensure safety.

[0043] This application also provides a method for verifying Ampere's law, including the following steps:

[0044] Step 1: Inject the conductive liquid into the slender strip-shaped groove at the top of the container that can hold the conductive liquid, place the covered container on the weighing platform of the high-precision electronic scale, place the conductive liquid container and the bracket properly, so that the metal electrodes are immersed in the conductive liquid and do not touch the inner wall of the container;

[0045] Step 2: Fix the magnets, place the container filled with the conductive liquid between the magnetic poles of the electromagnet, close to the middle position of the magnet surface, and make the plane where the conductive liquid is located perpendicular to the magnetic field direction;

[0046] Step 3: Electrically connect the DC power supply, the high-power resistor and the metal electrodes on the bracket, form a closed circuit through the conductive liquid, and set the DC power supply to the constant current mode as required;

[0047] Step 4: Carefully adjust the position of the container and the bracket to ensure that the container and the bracket are not in contact to prevent possible other forces from interfering with the measurement of Ampere's force;

[0048] Step 5: Zero the electronic scale when the current is zero, change the output current size of the DC power supply, obtain the magnitude of the Ampere's force received by the conductive liquid at different currents by recording the readings of the high-precision electronic scale, and draw relevant charts;

[0049] Step 6: Use a precision length measuring tool to measure and record the distance between the metal electrodes, change the distance between the metal electrodes, repeat the test in Step 5 above, record the magnitude of the Ampere's force received by the conductive liquid at different currents, and draw relevant charts to compare the relationship between the magnitudes of the Ampere's force at different distances;

[0050] Step 7: Adjust the magnet configuration to change the magnetic induction intensity, repeat the test in Step 5 above, record the magnitude of the Ampere's force received by the conductive liquid at different currents, and draw relevant charts to compare the relationship between the magnitudes of the Ampere's force at different magnetic induction intensities;

[0051] Step 8: Analyze Ampere's law based on the experimental data.

[0052] In the experiment, the experimental device 100 of the present utility model embodiment includes: a high-precision DC power supply (supporting constant current and constant voltage modes, with current and voltage displays) 10, a high-power corrugated wire-wound resistor 20 (high-power resistor), two metal electrodes 30 respectively serving as positive and negative electrodes (made of copper wire or copper sheet), a bracket 40, a vernier caliper (not shown), a neodymium iron boron super magnet 60, a container 70 filled with a conductive liquid, a high-precision electronic scale 80 (with an accuracy of 0.01 g and a zero-adjustment function), etc. Among them, the conductive liquid can be a highly saturated saline solution or a liquid metal. Liquid metals generally include elemental liquid metals (such as mercury, gallium, rubidium, cesium, etc.) and alloy liquid metals such as gallium indium tin alloy or mercury. In this embodiment, a gallium indium tin alloy with a melting point of six degrees Celsius is used. This alloy has good safety and has been applied to the manufacture of thermometers. A horizontal structure (not shown) for placing the magnet 60 is installed on the bracket 40 to keep the magnet 60 stable.

[0053] In this embodiment, the high-precision DC power supply (supporting constant current and constant voltage modes, with current and voltage displays) 10 is used to provide power in the experiment. It can very conveniently adjust the required current magnitude and read the current data, and can adjust parameters according to the circuit changes to maintain a stable current output; the high-power corrugated wire-wound resistor 20 is used to limit the maximum current in the circuit to prevent the loop resistance from being too low and the circuit from short-circuiting; the two metal electrodes 30 respectively serving as positive and negative electrodes are used to provide current to the conductive liquid serving as the current carrier, conduct the entire circuit, and in this embodiment, copper metal wires are used as the metal electrodes; the bracket 40 is used to place the metal electrodes and the magnet, and connect the DC power supply and the high-power resistor; the vernier caliper is used to measure the distance between the two metal electrodes 30 (corresponding to the length of the wire L in the Ampere force formula); the N52 neodymium iron boron super magnet 60 is used to provide a magnetic field; the container 70 filled with the conductive liquid is used to hold the conductive liquid serving as the current carrier, and the conductive liquid conducts the metal electrodes 30 of the positive and negative electrodes and bears the Ampere force in the magnetic field; the high-precision electronic scale 80 is used to measure the magnitude of the Ampere force.

[0054] The experimental steps of the embodiment of the present application are as follows:

[0055] Step 1: Inject the conductive liquid into the groove of the container 70, place the container 70 on the high-precision electronic scale 80, install a bracket on the container 70, fix the copper electrode 40 on the bracket and immerse the copper electrode 40 in the conductive liquid, and the copper electrode 40 does not touch the inner wall of the container 70;

[0056] Step 2: Fix the magnet 60, place the container 70 filled with the conductive liquid between the magnetic poles of the magnet 60, close to the middle position of the magnet surface, and make the plane where the conductive liquid is located perpendicular to the magnetic field direction;

[0057] Step 3: Connect the DC power supply 10, the high-power resistor 20 and the copper electrode 30 on the bracket to form a closed circuit through the conductive liquid, and set the DC power supply to the constant current mode as required;

[0058] Step 4: Carefully adjust the positions of the container of the conductive liquid and the bracket to ensure that there is no contact between the container of the conductive liquid and the bracket, and prevent possible other forces from interfering with the measurement of the Ampere force;

[0059] Step 5: Zero the electronic scale when the current is zero. Change the output current of the DC power supply, obtain the magnitude of the Ampere force received by the conductive liquid at different currents by recording the readings of the high-precision electronic scale, and draw relevant charts;

[0060] Measure and record the distance between the copper electrodes. Change the distance between the copper electrodes, repeat the test in Step 5 above, record the magnitude of the Ampere force received by the conductive liquid at different currents, and draw relevant charts to compare the relationship between the magnitudes of the Ampere force at different distances;

[0061] Adjust the configuration of the magnet to change the magnetic induction intensity, repeat the test in Step 5 above, record the magnitude of the Ampere force received by the conductive liquid at different currents, and draw relevant charts to compare the relationship between the magnitudes of the Ampere force at different magnetic induction intensities.

[0062] Example 1:

[0063] The experimental steps of Example 1 of the present utility model are as follows:

[0064] Step 1: Inject the conductive liquid into the groove of the container 70, place the container 70 on the high-precision electronic scale 80, install a bracket on the container 70, fix the copper electrode 40 on the bracket and immerse the copper electrode 40 in the conductive liquid, and the copper electrode 40 does not touch the inner wall of the container 70;

[0065] Step 2: Fix a magnet 60 (only one magnet is set), place the container 70 filled with the conductive liquid between the magnetic poles of the magnet 60, close to the middle position of the magnet surface, and make the plane where the conductive liquid is located perpendicular to the magnetic field direction;

[0066] Step 3: Connect the DC power supply 10, the wire-wound resistor 20 and the copper electrode 30 on the bracket to form a closed circuit through the conductive liquid, and set the DC power supply to the constant current mode as required;

[0067] Step 4: Carefully adjust the positions of the container of the conductive liquid and the bracket to ensure that there is no contact between the container of the conductive liquid and the bracket, and prevent possible other forces from interfering with the measurement of the Ampere force;

[0068] Step 5: When the current is zero, zero the electronic scale, set the distance between the two copper electrodes 30 to 25.2 mm, change the output current of the DC power supply, and adjust the current to 0 A, 1 A, 2 A, 3 A, 4 A, 5 A; record the magnitudes of the Ampere forces received by the conductive liquid at different currents, that is, the magnitudes of the Ampere forces correspond to 0, 0.43, 0.87, 1.3, 1.72, 2.16, and their unit is 9.8*10 - 3 N, the above are the first set of data; set the distance between the two copper electrodes 30 to 16.1 mm, change the output current of the DC power supply, and adjust the current to 0 A, 1 A, 2 A, 3 A, 4 A, 5 A; record the magnitudes of the Ampere forces received by the conductive liquid at different currents, that is, the magnitudes of the Ampere forces correspond to 0, 0.28, 0.55, 0.82, 1.09, 1.35, and their unit is 9.8*10 -3 N, the above are the second set of data. According to the formula of Ampere force: F = BIL, where B represents the magnetic field strength; I represents the current intensity; L represents the wire length, input these data into a mathematical tool (such as Matlab, MathType, the built-in mathematical tool of Excel, etc.) for data analysis. In this embodiment, use the built-in data analysis tool of Excel for analysis. When L = 25.2 mm, the fitting formula y = 0.4314x + 0.0014 is obtained,

[0069] R 2 = 1, where the x-axis represents the current intensity and the y-axis represents the electronic scale reading (the magnitude of the Ampere force), and R 2 is the magnitude of the credibility; when L = 16.1 mm, the fitting formula y = 0.27x + 0.0067 is obtained,

[0070] R 2 = 0.9999; compare the ratio of the wire lengths of the first set and the second set above (25.2:16.1) with the ratio of the fitting coefficients of the first set and the second set (0.4314:0.27) again, and the relative proportion value 97.96% is obtained. This also verifies that the formula of this Ampere force: F = BIL is relatively reliable, as Figure 4 shown.

[0071] Example 2:

[0072] The experimental steps of the second embodiment of the present utility model are as follows:

[0073] Step 1: Inject the conductive liquid into the trough of the container 70, place the container 70 on a high-precision electronic scale 80, install a bracket on the container 70, fix the copper electrode 40 on the bracket and make the copper electrode 40 soak into the conductive liquid, and the copper electrode 40 does not touch the inner wall of the container 70;

[0074] Step 2: Fix one magnet 60 or two magnets 60, place the container 70 filled with conductive liquid between the magnetic poles of the magnet 60, close to the middle position of the magnet surface, and make the plane where the conductive liquid is located perpendicular to the magnetic field direction; if two magnets 60 are set, the two magnets 60 are symmetrically arranged with respect to the container 70;

[0075] Step 3: Connect the DC power supply 10, the winding resistor 20 and the copper electrode 30 on the bracket to form a closed circuit through the conductive liquid, and set the DC power supply to the constant current mode as required;

[0076] Step 4: Carefully adjust the positions of the container of the conductive liquid and the bracket to ensure that there is no contact between the container of the conductive liquid and the bracket, and prevent possible interference from other forces to the measurement of the Ampere force;

[0077] Step 5: Zero the electronic scale when the current is zero, set the distance between the two copper electrodes 30 to a certain value, which is 31.4 mm, and set two symmetric magnets. Change the output current of the DC power supply and adjust the current to 0 A, 1 A, 2 A, 3 A, 4 A, 5 A; record the magnitudes of the Ampere forces received by the conductive liquid at different currents, that is, the magnitudes of the Ampere forces correspond to 0, 1.13, 2.21, 3.29, 4.36, 5.14, and their unit is 9.8*10 -3 N, the above are the first set of data; if only one magnet is set, change the output current of the DC power supply and adjust the current to 0 A, 1 A, 2 A, 3 A, 4 A, 5 A; record the magnitudes of the Ampere forces received by the conductive liquid at different currents, that is, the magnitudes of the Ampere forces correspond to 0, 0.57, 1.13, 1.68, 2.21, 2.76, and their unit is 9.8*10 - 3 N, the above are the second set of data. According to the formula of the Ampere force: F = BIL, where B represents the magnetic field strength; I represents the current intensity; L represents the wire length, input these data into a mathematical tool (such as Matlab, MathType, the built-in mathematical tool of Excel, etc.) for data analysis. In this embodiment, use the built-in data analysis tool of Excel for analysis. When there are two magnets, the fitting formula y = 1.0806x + 0.0319, R 2 = 0.9999 is obtained, where the x-axis represents the current intensity and the y-axis represents the reading of the electronic scale (the magnitude of the Ampere force), and R 2 is the magnitude of the credibility; when there is only one magnet, the fitting formula y = 0.5506x + 0.0152, R 2=0.9999; the ratio of the magnetic induction intensity of the first group and the second group (2:1) is compared again with the ratio of the fitting coefficients of the first group and the second group (1.081:0.551), and the relative ratio value is 98.13%. This also verifies that the formula of the Ampere force: F=BIL is relatively reliable, such as Figure 4 shown.

[0078] Through this experimental device, by exploring the Ampere force on the conductive liquid in the magnetic field, the relationship between the Ampere force and the magnetic induction intensity, the current intensity and the conductor length is studied. According to the experimental data, the following conclusions can be drawn: Under the condition that the magnetic induction intensity and the conductor length remain unchanged, the magnitude of the Ampere force is proportional to the current intensity. Under the condition that the magnetic induction intensity and the current intensity remain unchanged, the magnitude of the Ampere force is proportional to the conductor length. Under the condition that the current intensity and the conductor length remain unchanged, the magnitude of the Ampere force is proportional to the magnetic induction intensity.

[0079] The experimental results show that the magnitude of the Ampere force is proportional to the current intensity, the conductor length and the magnetic induction intensity, which conforms to the formula of the Ampere force: F = BIL, where B represents the magnetic field intensity; I represents the current intensity; and L represents the length of the wire. There are certain errors in the experimental data, but through the analysis and discussion of the experimental data, these errors may be due to experimental measurement errors or environmental interference. The research conclusions of the verification experiment of this application can provide a reference for our in-depth understanding of the Ampere force in electromagnetism.

[0080] It is understood that in the present application, the magnet can be replaced by an electromagnet. It is understood that in the present application, for the case where the magnetic induction intensity B and the current intensity I are not perpendicular but have a certain angle, this can be achieved by adjusting the relative position of the metal electrodes on the bracket or by adding an electrode rotating structure to the bracket.

[0081] The verification experiment of this application optimizes and improves the traditional experimental device for exploring the size of the Ampere force. By using a conductive liquid as a current carrier to measure the Ampere force in its magnetic field, the current loop connection and structure are simplified, the system is electronic and digital, easy to operate and control, intuitive and can be measured quantitatively with high precision. The Ampere force law can be verified by the control variable method, with a simple structure, convenient operation, and easy promotion. Improving the qualitative analysis experiment into a quantitative research experiment is more conducive to the grasp of the Ampere force law in learning.

[0082] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An experimental device for verifying Ampere's law of force, characterized in that: The experimental device includes: a high-precision DC power supply, a high-power resistor, two metal electrodes serving as positive and negative electrodes, a bracket, a precision length measuring tool, two opposing magnets, a conductive liquid and a container containing the conductive liquid, and a high-precision electronic scale, wherein the high-precision DC power supply is used to provide power in the experiment, adjust the required current size and read current data, adjust parameters according to circuit changes, and maintain stable current output; The high-power resistor is used to limit the maximum current in the circuit to prevent the loop resistance from being too low and the circuit from being short-circuited; The two metal electrodes, which serve as positive and negative electrodes respectively, are used to provide current to the conductive liquid, which serves as a current carrier, to conduct the entire circuit; The bracket is used to place a metal electrode, and the metal electrode is electrically connected to the high-precision DC power supply and the high-power resistor through a wire; The precision length measuring tool is used to measure the distance between two metal electrodes; The two opposing magnets are used to provide a magnetic field; The container containing the conductive liquid is used to contain the conductive liquid as a current carrier and to withstand the Ampere force exerted on the conductive liquid in the magnetic field; The high-precision electronic scale is used to measure the magnitude of the Ampere force exerted on the conductive liquid by measuring the weight change of the container containing the conductive liquid.

2. An experimental device for verifying Ampere's law of force according to claim 1, characterized in that: The two magnets are placed on both sides of the slender strip groove provided at the top of the container, the length direction of the magnet is parallel to the slender strip groove, and the surface of the magnet with the largest area remains parallel to the side of the container but does not contact, so that the height of the center position of each magnet is consistent with the height of the conductive liquid in the slender strip groove.

3. An experimental device for verifying Ampere's law of force according to claim 2, characterized in that: The two magnets are rectangular magnets with completely identical magnetic fields, and the length and width of the magnets should be greater than the length and width of the elongated strip grooves of the container so that the magnetic field to which the conductive liquid is subjected is as uniform as possible.

4. The experimental device for verifying Ampere's law of force according to claim 1, characterized in that: The conductive liquid is a highly saturated salt water solution or a liquid metal.

5. An experimental device for verifying Ampere's law of force according to claim 4, characterized in that: The liquid metal is a gallium-indium-tin alloy having a melting point lower than room temperature.

6. An experimental device for verifying Ampere's law of force according to claim 1, characterized in that: The precision length measuring tool is a vernier caliper; the high-precision DC power supply adopts a digital display high-precision current-stabilized and voltage-stabilized DC power supply.

7. An experimental device for verifying Ampere's law of force according to claim 1, characterized in that: The magnet is a neodymium iron boron super strong magnet.

8. An experimental device for verifying Ampere's law of force according to claim 1, characterized in that: The metal electrode is made of copper wire.

Images