Device for quantitatively verifying Faraday's law of electromagnetic induction

Abstract

The utility model discloses a device for quantitatively verifying Faraday's law of electromagnetic induction, the device comprises a plastic bottom plate, a rotating shaft, a magnet, a coil, two first acrylic plates and a second acrylic plate, a bearing is arranged at the center of the plastic bottom plate, the rotating shaft is connected with the bearing, the number of the first acrylic plates is two, and the magnet is connected with the coil. The two first acrylic plates and the second acrylic plates are fixedly connected with the outer wall of the bearing, the included angle between the two first acrylic plates is 180 degrees, the coils are arranged at the ends of the first acrylic plates respectively, one end of each second acrylic plate is rotationally connected with the rotating shaft, the second acrylic plates are driven by external force to rotate with the rotating shaft as the axis, and the first acrylic plates and the second acrylic plates are fixedly connected with the outer wall of the bearing. The magnet is arranged at the other end of the second acrylic plate, the coils are electrically connected with the corresponding voltage sensors respectively, and the voltage sensors are in signal connection with a master control terminal.

Description

Technical Field

[0001] The utility model relates to the technical field of physical teaching experiment appliances, in particular to a device for quantitatively verifying Faraday's law of electromagnetic induction. Background Art

[0002] Faraday's law of electromagnetic induction is an important law in high school physics. Among the existing technologies for verifying Faraday's law of electromagnetic induction, one type requires sensors, computers, and classroom multimedia systems, which are only configured in high school and are not intuitive enough. Many students will doubt the authenticity of computer graphics. Another type uses ammeters or voltmeters to display, which is relatively economical, but the experimental effects vary. No matter which type, the common method is to let a strong magnet fall freely from the upper end of a long glass tube through a coil, making the coil 20 cm, 30 cm, 40 cm, and 50 cm away from the upper tube opening respectively, recording the voltmeter readings and the phenomena that occur, changing the number of turns of the coil and the intensity of the magnet respectively, repeating the above experiments, and drawing qualitative conclusions. The above experiments cannot quantitatively explore Faraday's law of electromagnetic induction. Secondly, the magnet will bounce violently when it quickly reaches the bottom end. Even with shock pads installed, the bounce is still obvious. Therefore, it is hoped to find a device for verifying Faraday's law of electromagnetic induction with simple and economical experimental equipment, convenient operation, and high accuracy. Content of the Utility Model

[0003] Aiming at the above-mentioned prior art, the utility model aims to provide a device for quantitatively verifying Faraday's law of electromagnetic induction, mainly solving the technical problems existing in the above background art.

[0004] To achieve the above purpose, the technical solution of the embodiment of the utility model is realized as follows:

[0005] A device for quantitatively verifying Faraday's law of electromagnetic induction, the device includes a plastic bottom plate, a rotating shaft, a magnet, a coil, a first acrylic plate, and a second acrylic plate. A bearing is provided at the center of the plastic bottom plate, and the rotating shaft is connected to the bearing. The number of the first acrylic plates is two, both are fixedly connected to the outer wall of the bearing, and the included angle between the two first acrylic plates is 180°. The coils are respectively arranged at the ends of the first acrylic plates. One end of the second acrylic plate is rotatably connected to the rotating shaft. Under the drive of an external force, the second acrylic plate rotates around the rotating shaft as the axis, and the magnet is arranged at the other end of the second acrylic plate. The coils are respectively electrically connected to corresponding voltage sensors, and the voltage sensors are signal-connected to the main control terminal.

[0006] Optionally, the coil is composed of a skeleton and copper enameled wire, and the copper enameled wire is wound around the skeleton.

[0007] Optionally, the bobbins of the two coils are of different sizes, but the number of turns of the coils is the same.

[0008] Optionally, the bobbins of the two coils are of the same size, but the number of turns of the coils is different.

[0009] Optionally, the length of the second acrylic plate is less than that of the first acrylic plate.

[0010] The beneficial effects of the present utility model are as follows: The device for quantitatively verifying Faraday's law of electromagnetic induction provided by this application adopts a simple mechanical structure design, reducing the cost of experimental equipment, enabling more schools to afford such experimental equipment. Secondly, the experiment is carried out by manually rotating the magnet, avoiding the violent rebound phenomenon generated when the magnet free-falls in traditional experiments, making the experimental process more intuitive. Compared with traditional qualitative analysis, this device can accurately measure and record the induced electromotive force in the coil through a voltage sensor and a main control terminal, thereby realizing the quantitative verification of Faraday's law of electromagnetic induction. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the device for quantitatively verifying Faraday's law of electromagnetic induction in the embodiment of this application;

[0012] Figure 2 It is a graph showing the variation of the induced electromotive force of one of the coils with time when the coil turn ratio is 40:80 in Embodiment 2 of this application;

[0013] Figure 3 It is a graph showing the variation of the induced electromotive force of the other coil with time when the coil turn ratio is 40:80 in Embodiment 2 of this application;

[0014] Figure 4 It is a graph showing the variation of the induced electromotive force of one of the coils with time when the coil turn ratio is 30:90 in Embodiment 2 of this application;

[0015] Figure 5 It is a graph showing the variation of the induced electromotive force of the other coil with time when the coil turn ratio is 30:90 in Embodiment 2 of this application;

[0016] Figure 6 It is a graph showing the variation of the induced electromotive force of one of the coils with time when the coil turn ratio is 50:75 in Embodiment 2 of this application;

[0017] Figure 7 It is a graph showing the variation of the induced electromotive force of the other coil with time when the coil turn ratio is 50:75 in Embodiment 2 of this application;

[0018] Figure 8In Embodiment 3 of this application, it is the image of the induced electromotive force of one of the coils changing with time when the coil area ratio is 3:2;

[0019] Figure 9 In Embodiment 3 of this application, it is the image of the induced electromotive force of the other coil changing with time when the coil area ratio is 3:2;

[0020] Figure 10 In Embodiment 3 of this application, it is the image of the induced electromotive force of one of the coils changing with time when the coil area ratio is 3:1;

[0021] Figure 11 In Embodiment 3 of this application, it is the image of the induced electromotive force of the other coil changing with time when the coil area ratio is 3:1;

[0022] Figure 12 In Embodiment 3 of this application, it is the image of the induced electromotive force of one of the coils changing with time when the coil area ratio is 2:1;

[0023] Figure 13 In Embodiment 3 of this application, it is the image of the induced electromotive force of the other coil changing with time when the coil area ratio is 2:1;

[0024] Explanation of the reference numerals in the drawings:

[0025] 1. Plastic bottom plate; 2. Rotating shaft; 3. Magnet 3; 4. Coil; 5. First acrylic plate; 6. Second acrylic plate; 7. Bearing; 8. Voltage sensor. Detailed implementation manners

[0026] The following further elaborates on the technical solution of the present utility model in conjunction with the specification drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. In the following description, the expression "some embodiments" is described, which describes a subset of all possible embodiments. However, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0027] In the following description, a large number of specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the present utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present utility model, some technical features well known in the art are not described.

[0028] It should be understood that the present utility model can be implemented in different forms and should not be construed as limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the present utility model to those skilled in the art. And the purpose of the terms used herein is only to describe specific embodiments and not to limit the present utility model. When used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, determine the presence of the stated features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups. When used herein, the term "and / or" includes any and all combinations of the related listed items.

[0029] It should be further noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "inner", "outer", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0030] In order to thoroughly understand the present utility model, detailed structures will be presented in the following description to illustrate the technical solutions proposed by the present utility model. The optional embodiments of the present utility model are described in detail as follows. However, in addition to these detailed descriptions, the present utility model can also have other implementations.

[0031] Embodiment 1

[0032] Please refer to the attached Figure 1 , this application provides a device for quantitatively verifying Faraday's law of electromagnetic induction. The device includes a plastic base plate 1, a rotating shaft 2, a magnet 3, a coil 4, a first acrylic plate 5, and a second acrylic plate 6. A bearing 7 is provided at the center of the plastic base plate 1. The rotating shaft 2 is connected to the bearing 7. The number of the first acrylic plates 5 is two, both of which are fixedly connected to the outer wall of the bearing 7, and the included angle between the two first acrylic plates 5 is 180°. The coils 4 are respectively arranged at the ends of the first acrylic plates 5. One end of the second acrylic plate 6 is rotatably connected to the rotating shaft 2. Under the drive of an external force, the second acrylic plate 6 rotates around the rotating shaft 2 as the axis. The magnet 3 is arranged at the other end of the second acrylic plate 6. The coils 4 are respectively electrically connected to corresponding voltage sensors 8, and the voltage sensors 8 are signal-connected to the main control terminal.

[0033] During specific implementation, the above-mentioned connection relationship is first installed to form a device for quantitatively verifying Faraday's law of electromagnetic induction, and the device is placed vertically. When an experiment is needed, the operator manually rotates the second acrylic plate 6 so that the second acrylic plate 6 rotates around the rotating shaft 2, thereby rotating the magnet 3. When the magnet 3 rotates, it passes through the coil 4 located above / below, or to the left / right of the plastic base plate 1. When the magnet 3 passes through the coil 4, the coil 4 cuts the magnetic flux lines, thereby generating an induced electromotive force in the coil 4. The induced electromotive force signal is obtained by the voltage sensor 8 and transmitted to the main control terminal, thereby drawing an image of the change of the induced electromotive force over time at the main control terminal.

[0034] It should be noted that it is common knowledge and conventional technical means in the field for the main control terminal to draw an image of the change of the induced electromotive force over time based on the electromotive force signal. This embodiment does not improve this and will not be elaborated here.

[0035] In an optional embodiment, the coil 4 is composed of a skeleton and a copper enameled wire, wherein the copper enameled wire is wound on the skeleton, and the skeleton is manufactured by 3D printing.

[0036] In an optional embodiment, the two coils 4 have the same frame size, but the number of turns of the two coils 4 is the same.

[0037] To ensure that ΔΦ and N are constant, the two coils 4 are set to have the same frame size and the same number of turns. The coils 4 are fixed on the plastic base plate 1. The acrylic strip is manually moved to rotate the magnet 3. When the magnet 3 passes through the coil 4, due to the effect of resistance, the speed of the magnet 3 passing through the coil 4 becomes slower and slower, making the time for the magnet 3 to pass through the coil 4 longer and longer. The main control terminal is used to draw a graph of the change of the induced electromotive force over time to verify the relationship between the induced electromotive force E of the coil 4 and the time Δt. That is, when ΔΦ and N are constant, EΔt is a constant value, which means

[0038] Furthermore, the length of the second acrylic plate 6 is smaller than that of the first acrylic plate 5 , so that when the two acrylic plates rotate around the rotating shaft 2 , the magnets 3 thereon will not collide with the coil 4 .

[0039] Example 2

[0040] The difference between the second embodiment and the first embodiment is that the two coils 4 have the same size of skeleton, but the number of turns of the coils 4 is different.

[0041] Exemplarily, the skeletons of the two coils 4 are set to have the same size, but the number of turns of the coils 4 is different. The coils 4 are fixed on the plastic base plate 1. When the acrylic strip is toggled by hand to rotate the magnet 3, when the magnet 3 rotates past the skeleton, the ΔΦ and Δt of the two coils 4 can be made constant. By using the main control terminal to draw the image of the induced electromotive force changing with time, the relationship between the induced electromotive force E and the number of turns N of the two coils 4 can be verified.

[0042] In a possible implementation manner, the turn ratio of the two coils 4 is 40:80, and the image of the induced electromotive force changing with time is as Figure 2 and Figure 3 shown. At the same moment, the values of the electromotive force are read. The value at the position marked with a triangular symbol on the blue line is 0.4024 V, and the value at the position marked with a triangular symbol on the red line is 0.8059 V. The ratio of the induced electromotive forces of the two coils 4 is approximately 1:2, which is approximately equal to the turn ratio of the coils 4.

[0043] In a possible implementation manner, the turn ratio of the two coils 4 is 30:90, and the image of the induced electromotive force changing with time is as Figure 4 and Figure 5 shown. At the same moment, the values of the electromotive force are read. The value at the position marked with a triangular symbol on the blue line is 0.2982 V, and the value at the position marked with a triangular symbol on the red line is 0.9142 V. The ratio of the induced electromotive forces of the two coils 4 is approximately 1:3, which is approximately equal to the turn ratio of the coils 4.

[0044] In a possible implementation manner, the turn ratio of the two coils 4 is 50:75, and the image of the induced electromotive force changing with time is as Figure 6 and Figure 7 shown. At the same moment, the values of the electromotive force are read. The value at the position marked with a triangular symbol on the blue line is 0.5372 V, and the value at the position marked with a triangular symbol on the red line is 0.8059 V. The ratio of the induced electromotive forces of the two coils 4 is approximately 2:3, which is approximately equal to the turn ratio of the coils 4.

[0045] The above three groups of experiments all show that when ΔΦ and Δt are constant, E ∝ N.

[0046] Example 3

[0047] The difference between this Example 3 and Example 2 and Example 1 is that the skeletons of the two coils 4 are different in size, but the number of turns of the coils 4 is the same.

[0048] In a possible implementation manner, the skeleton of one of the coils 4 is annular, and the skeleton of the other coil 4 is fan-shaped, and the number of turns of the two coils 4 is the same. Since the skeletons of the coils 4 are different but the number of turns is the same, the areas of the coils 4 are also different.

[0049] When the area ratio of coil 4 is 3:2, the graph of the induced electromotive force varying with time is as shown in Figure 8 and Figure 9 shown. At the same moment, the value of the electromotive force is read. The value at the position marked with a triangular symbol on the blue line is 0.3160 V. The ratio of the induced electromotive forces of the two coils 4 is approximately 3:2. The value at the position marked with a triangular symbol on the red line is 0.2095 V, which is approximately equal to the area ratio of coil 4.

[0050] When the area ratio of coil 4 is 3:1, the graph of the induced electromotive force varying with time is as shown in Figure 9 and Figure 10 shown. At the same moment, the value of the electromotive force is read. The value at the position marked with a triangular symbol on the blue line is 0.4514 V. The value at the position marked with a triangular symbol on the red line is 0.1658 V. The ratio of the induced electromotive forces of the two coils 4 is approximately 3:1, which is approximately equal to the area ratio of coil 4.

[0051] When the area ratio of coil 4 is 2:1, the graph of the induced electromotive force varying with time is as shown in Figure 11 and Figure 12 shown. At the same moment, the value of the electromotive force is read. The value at the position marked with a triangular symbol on the blue line is 0.3468 V. The value at the position marked with a triangular symbol on the red line is 0.1569 V. The ratio of the induced electromotive forces of the two coils 4 is approximately 2:1, which is approximately equal to the area ratio of coil 4.

[0052] The above three groups of experiments all show that when N and Δt are constant, E ∝ ΔΦ.

[0053] In summary, according to the above embodiments, within the allowable error range, the Faraday's law of electromagnetic induction is verified.

[0054] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the said claims.

Claims

1. An apparatus for quantitatively verifying Faraday's law of electromagnetic induction, characterized in that, The device includes a plastic bottom plate, a rotating shaft, magnets, coils, a first acrylic plate, and a second acrylic plate. A bearing is provided at the center of the plastic bottom plate, and the rotating shaft is connected to the bearing. The number of the first acrylic plates is two, both of which are fixedly connected to the outer wall of the bearing, and the included angle between the two first acrylic plates is 180°. The coils are respectively arranged at the ends of the first acrylic plates. One end of the second acrylic plate is rotatably connected to the rotating shaft, and under the drive of an external force, the second acrylic plate rotates around the rotating shaft as the axis. The magnets are arranged at the other end of the second acrylic plate. The coils are respectively electrically connected to corresponding voltage sensors, and the voltage sensors are signal-connected to the main control terminal.

2. The device for quantitatively verifying Faraday's law of electromagnetic induction according to claim 1, wherein The coil is composed of a skeleton and a copper enameled wire, and the copper enameled wire is wound around the skeleton.

3. The device for quantitatively verifying Faraday's law of electromagnetic induction according to claim 2, characterized in that, The skeletons of the two coils are of different sizes, but the number of turns of the coils is the same.

4. A device for quantitatively verifying Faraday's law of electromagnetic induction according to claim 2, characterized in that, The skeletons of the two coils are of the same size, but the number of turns of the coils is different.

5. A device for quantitatively verifying Faraday's law of electromagnetic induction according to claim 1, characterized in that The length of the second acrylic plate is less than that of the first acrylic plate.

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