Magnetic induction intensity measurement teaching aid

Abstract

The utility model discloses a magnetic induction intensity measurement teaching aid, which comprises a bottom plate, a turntable, a strong magnet, a binding post and a coil, an inverted U-shaped bracket consisting of two side plates and a top plate is inserted on the bottom plate, the bottoms of the two side plates are inserted on the bottom plate, and a support plate is connected between the two side plates; the rotating disc is located between the two side plates, provided with scales and rotationally connected to the bottom plate. The two strong magnets are placed on the turntable in parallel, and the opposite sides of the two strong magnets have opposite magnetic poles; each binding post is connected to the supporting plate in a penetrating manner; the coil can amplify the Ampere force borne by the wire, the whole coil is equally divided into multiple turns, the coil is hung below the supporting plate, and the lower hanging end of the coil is located between the two strong magnets. The teaching instrument adopts the multi-tap coil, that is, each coil with equally divided turns can be connected with two corresponding adjacent binding posts; the effective length of the wire can be changed by changing the binding post.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching aids, in particular to a magnetic induction intensity measurement teaching aid. Background Art

[0002] Magnetic induction intensity is the key and difficult point of middle school physics teaching. Combined with the experiments in the current physics textbooks, teachers need to make their own teaching aids to demonstrate the experiments to students.

[0003] Currently available teaching tools use the force sensors and current sensors in the DIS system to conduct quantitative research. Although the tool can clearly show students the experiment of magnetic induction intensity detection, due to the high price of DIS, most schools can only have teachers demonstrate it, and students cannot conduct experiments themselves, which is not conducive to students' independent research. At the same time, the tool is not convenient to carry because it needs to use a computer to present data. Utility Model Content

[0004] The utility model aims to provide a magnetic induction intensity measurement teaching aid to solve the technical problems in the existing devices.

[0005] In order to solve the above technical problems, the utility model specifically provides the following technical solutions: a magnetic induction intensity measurement teaching aid, comprising:

[0006] A bottom plate, wherein an inverted U-shaped bracket consisting of two side plates and a top plate is inserted on the bottom plate, the top plate is horizontally mounted on the tops of the two side plates, the bottoms of the two side plates are inserted on the bottom plate, and a support plate is connected between the two side plates;

[0007] A turntable, rotatably connected to the bottom plate, the turntable being located between the two side plates;

[0008] Two strong magnets are provided, and the two strong magnets are placed in parallel on the turntable, and the magnetic poles of the two strong magnets on opposite sides are opposite;

[0009] A plurality of binding posts are arranged in sequence, and each of the binding posts is connected through the support plate;

[0010] The coil is divided into multiple turns, and the coil is suspended below the support plate. The lower end of the coil is located between the two strong magnets, and one turn of the coil is connected to two adjacent terminals.

[0011] As a preferred solution of the utility model, the coil is configured to have 300 turns, and every 50 turns of the coil are connected to two adjacent terminals.

[0012] As a preferred solution of the utility model, a marking block is arranged on the support plate at a position corresponding to each of the terminal posts, and each of the marking blocks is marked with numbers in sequence.

[0013] As a preferred solution of the utility model, a wireless force sensor is provided on the top plate, and the wireless force sensor is connected to the coil via a cotton thread;

[0014] A through hole for the cotton thread to pass through is provided at the center of the inner cavity of the support plate.

[0015] As a preferred solution of the utility model, a limiting plate is arranged between the two side plates below the support plate, and a limiting hole for the coil to pass through is opened at the center of the inner cavity of the limiting plate.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The teaching instrument adopts a multi-tap coil, that is, each coil with equal turns can be connected to two adjacent terminals. The effective length of the wire can be changed by changing the interval between the terminals, thereby amplifying the force on the wire.

[0018] At the same time, the turntable is connected to a strong magnet as a whole. The rotation of the turntable can measure the quantitative relationship between the Ampere force, the direction of the magnetic field and the angle between the conductor.

[0019] At the same time, the homemade wireless force sensor and mobile phone software can be used to measure the size of the Ampere force. After data analysis, it can be concluded that the two are in a proportional relationship. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 For the utility model Figure 1 Schematic diagram of the structure of the middle part;

[0023] Figure 3 For the utility model Figure 1 Schematic diagram of the connection structure between the midsole plate and the turntable;

[0024] The numbers in the figure represent the following:

[0025] 1. Bottom plate; 2. Side plate; 3. Top plate; 4. Support plate; 5. Turntable; 6. Strong magnet; 7. Terminal block; 8. Coil; 9. Marking block; 10. Wireless force sensor; 11. Cotton thread; 12. Limit plate; 13. Limit hole; 14. Through hole; 15. Current sensor. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figure 1-3 As shown, a magnetic induction intensity measurement teaching aid comprises:

[0028] A bottom plate 1, an inverted U-shaped bracket consisting of two side plates 2 and a top plate 3 is plugged into the bottom plate 1, the top plate 3 is horizontally mounted on the tops of the two side plates 2, the bottoms of the two side plates 2 are plugged into the bottom plate 1, and a support plate 4 is connected between the two side plates 2;

[0029] A turntable 5 is rotatably connected to the bottom plate 1, and the turntable 5 is located between the two side plates 2;

[0030] Two strong magnets 6 are provided, and the two strong magnets 6 are placed in parallel on the turntable 5, and the magnetic poles of the two strong magnets 6 on opposite sides are opposite;

[0031] A plurality of terminal posts 7 are arranged in sequence, and each terminal post 7 is connected to the support plate 4 through the terminal post 7, that is, one end of the terminal post 7 is above the support plate 4, and the other end of the terminal post 7 is connected to the bottom of the support plate 4;

[0032] The coil 8 is divided into multiple turns. The coil 8 is suspended below the support plate 4 . The lower end of the coil 8 is located between two strong magnets 6 . One turn of the coil 8 is connected to two adjacent terminals 7 .

[0033] The teaching instrument adopts a multi-tap coil, that is, each coil with equal turns can be connected to two adjacent terminals. The effective length of the wire can be changed by changing the interval between the terminals, thereby amplifying the force on the wire.

[0034] At the same time, the turntable is connected to a strong magnet as a whole. The rotation of the turntable can measure the quantitative relationship between the Ampere force, the direction of the magnetic field and the angle between the conductor.

[0035] Optionally, the diameter of the turntable 5 is 30 cm, and the surface of the turntable has angle scales.

[0036] The side panel 2 can be plugged into the bottom panel 1, that is, a seat body with a middle slot is installed on the bottom panel 1. When installing, the side panel can be directly inserted into the middle slot on the seat body, and when removing, it can be directly pulled out.

[0037] Specifically, Figure 1-3 As shown, the coil 8 is set to 300 turns, and the coil 8 is connected to two adjacent terminals 7 every 50 turns. This can amplify the force on the wire, and the coil 8 with equally divided turns can also facilitate the calculation of the length of the wire.

[0038] Since the coil is divided into six equal parts, it is equivalent to that the entire coil 8 has a total of seven connection points, so the number of the connecting posts 7 should also be set to seven accordingly, that is, one connecting post 7 corresponds to one connection point.

[0039] Further, such as Figure 1-2 As shown, a marking block 9 is provided on the support plate 4 at a position corresponding to each terminal 7. Each marking block 9 is marked with numbers in sequence, and the numbers are arranged from small to large, so that during the experiment, students can clearly understand the situation of the actually connected terminals.

[0040] In the actual experiment, the force applied to the coil 8 cannot be observed by human eyes, so it needs to be reflected with the help of external tools.

[0041] Specifically, Figure 1-2 As shown, a wireless force sensor 10 is provided on the top plate 3, and the wireless force sensor 10 is connected to the coil 8 via a cotton thread 11;

[0042] A through hole 14 is provided at the center of the inner cavity of the support plate 4 for the cotton thread 11 to pass through.

[0043] The through hole 14 just passes through the support plate 4, thereby facilitating the suspension connection of the coil 8 and will not interfere with the suspension of the coil.

[0044] Since the coil 8 is in a suspended state and the coil will deflect slightly after being subjected to the Ampere force, in order to make the measurement result more accurate, the position of the suspended coil needs to be limited.

[0045] Specifically, Figure 1-3 As shown, a limiting plate 12 is arranged between the two side plates 2 below the support plate 4, and a limiting hole 13 for the coil 8 to pass through is opened at the center of the inner cavity of the limiting plate 12.

[0046] The size of the through hole 14 is slightly larger than the width of the coil 8 , so that the coil can be limited in the through hole, thereby avoiding the possibility of the coil 8 deflecting left and right.

[0047] When using the device, it is also necessary to cooperate with a resistance box, a current sensor, a student power supply, a wire and a control switch of the circuit. Its use and connection method are the same as the connection method of the existing magnetic induction intensity measurement. In use, the instrument is connected according to the conventional wiring method. The difference is that the ammeter is replaced by a current sensor 15, and the coil is connected in series to the circuit through a wire connection terminal 7. First, the mobile phone is connected to the wireless force sensor 10 and the circuit sensor 15 by Bluetooth, and the sensor is zeroed to start the experiment. For the convenience of data processing, it is recommended to use the control variable method.

[0048] Keep the number of turns of coil 8 unchanged and record it. That is, each time you measure, the terminal 7 connected to the line remains unchanged. By changing the resistance value of the resistor box, you can change the current. Record the current and the Ampere force on the phyphox software.

[0049] Keep the current unchanged and record it. By changing the spacing of the terminal 7 connected to the circuit, the spacing of the terminal 7 increases, that is, the number of turns of the connected coil will also increase, thereby changing the number of turns of the coil 8. Record the number of turns of the coil and the size of the Ampere force on the phyphox software;

[0050] Keeping other conditions unchanged, change the angle between the current direction and the magnetic field direction by rotating the dial 5. Record the angle and the magnitude of the Ampere force on the phyphox software;

[0051] Process the data and draw a picture. Draw the relationship between the Ampere force and the current and the effective length of the wire multiplied by the number of turns of the coil. You can also expand your knowledge and explore the relationship between the Ampere force and the angle between the current and the direction of the magnetic field.

[0052] The side panels 2, top panel 3, support panel 4 and limit panel 12 in the device are all made of acrylic material. The transparent material is conducive to students' observation of experiments.

[0053] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A magnetic induction intensity measurement teaching aid, characterized in that: include: A bottom plate (1), an inverted U-shaped bracket consisting of two side plates (2) and a top plate (3) is plugged into the bottom plate (1), the top plate (3) is horizontally mounted on the tops of the two side plates (2), the bottoms of the two side plates (2) are plugged into the bottom plate (1), and a support plate (4) is connected between the two side plates (2); A turntable (5) rotatably connected to the bottom plate (1), wherein the turntable (5) is located between the two side plates (2); Two strong magnets (6) are provided, and the two strong magnets (6) are placed in parallel on the turntable (5), and the magnetic poles of the two strong magnets (6) on opposite sides are opposite; A plurality of binding posts (7) are arranged in sequence, and each of the binding posts (7) is connected to the support plate (4); The coil (8) is divided into a plurality of turns. The coil (8) is suspended below the support plate (4). The lower end of the coil (8) is located between the two strong magnets (6). One turn of the coil (8) is connected to two adjacent terminals (7) respectively.

2. A magnetic induction intensity measurement teaching aid according to claim 1, characterized in that: The coil (8) is configured to have 300 turns, and every 50 turns of the coil (8) are connected to two adjacent terminals (7).

3. A magnetic induction intensity measurement teaching aid according to claim 1, characterized in that: A marking block (9) is arranged on the support plate (4) at a position corresponding to each of the terminal posts (7), and each of the marking blocks (9) is marked with numbers in sequence.

4. A magnetic induction intensity measurement teaching aid according to claim 1, characterized in that: A wireless force sensor (10) is arranged on the top plate (3), and the wireless force sensor (10) is connected to the coil (8) via a cotton thread (11); A through hole (14) for the cotton thread (11) to pass through is provided at the center of the inner cavity on the support plate (4).

5. A magnetic induction intensity measurement teaching aid according to claim 1, characterized in that: A limiting plate (12) is arranged between the two side plates (2) below the support plate (4), and a limiting hole (13) for the coil (8) to pass through is provided at the center of the inner cavity of the limiting plate (12).

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