Magnetic deflection trajectory teaching protractor

Abstract

The utility model relates to teaching appliance technical field discloses a magnetic deflection trajectory teaching protractor, include: protractor body, any one end of protractor body both ends still is provided with the protruding block, the protruding block inboard still is provided with fixed point subassembly, the fixed point subassembly center with protractor body edge place is tangent, when fixed, protractor body can rotate along the axis of fixed point subassembly to show particle magnetic deflection trajectory, the teaching protractor of this application can quickly delineate the trajectory of particle magnetic deflection, and the operation is simple relying on the rotating process of rotating protractor, since having fixed point, will not happen removal, rotates more accurate, and uses rotation to handle the trajectory problem of charged particle movement in complex field, need not draw multiple circles in the same figure, let the drawing be clearer.

Description

Technical Field

[0001] This utility model relates to the field of teaching equipment technology, specifically to a magnetic deflection trajectory teaching protractor. Background Technology

[0002] In high school physics, when studying the motion of charged particles in a uniform magnetic field (with a fixed orbital radius), students often encounter critical and range-related problems. These problems require the use of plotting the magnetic deflection trajectory of the particle. In existing conventional solutions, the first step is to draw multiple circles to determine the range (e.g., ...). Figure 5 As shown), the disadvantage of this approach is that excessive drawing leads to a cluttered and disorganized image, making it difficult to identify special points. Secondly, using a common protractor or circular object (such as a basin, clock, etc.) to represent the particle's trajectory for rotation (e.g.) Figure 6 As shown in the figure, the circular object will flatten during the rotation process, resulting in inaccurate trajectory and special points. Due to the above-mentioned defects in traditional solutions, the applicant proposes a teaching protractor to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to provide a magnetic deflection trajectory teaching protractor to solve the above-mentioned technical problems.

[0004] This utility model provides the following technical solution:

[0005] A magnetic deflection trajectory teaching protractor includes: a protractor body, with a protrusion at either end of the protractor body, and a fixing component on the inner side of the protrusion. The center of the fixing component is tangent to the edge of the protractor body. When the fixing component is fixed, the protractor body can rotate along the axis of the fixing component to display the magnetic deflection trajectory of the particles.

[0006] As a preferred embodiment of the above technical solution,

[0007] The protrusion is integrally formed on the protractor body.

[0008] As a preferred embodiment of the above technical solution,

[0009] The positioning component includes a sleeve that is rotatably inserted into the inside of the protrusion.

[0010] As a preferred embodiment of the above technical solution,

[0011] The inner side of the sleeve is also equipped with a fixed column that moves up and down.

[0012] As a preferred embodiment of the above technical solution,

[0013] The lower end of the fixed-point column is a cone.

[0014] As a preferred embodiment of the above technical solution,

[0015] The fixed post also includes a snap-fit ​​block, and a spring is provided inside the sleeve, with the upper end of the spring in contact with the lower end of the snap-fit ​​block.

[0016] As a preferred embodiment of the above technical solution,

[0017] The locking block is also symmetrically fixed with limiting points on both sides, and the inner wall of the sleeve is also provided with limiting grooves corresponding to the limiting points. The limiting points move linearly along the limiting grooves.

[0018] As a preferred embodiment of the above technical solution,

[0019] The protractor body is made of acrylic sheet.

[0020] As a preferred embodiment of the above technical solution,

[0021] The magnetic deflection trajectory teaching protractor is a semicircle formed by a set of protractor bodies.

[0022] As a preferred embodiment of the above technical solution,

[0023] The magnetic deflection trajectory teaching protractor is a full circle formed by two sets of the protractor bodies.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] In this invention, the teaching protractor of this application can quickly depict the trajectory of particle magnetic deflection. The rotation process of the rotating protractor is simple to operate. Since there is a fixed point, there will be no movement, and the rotation is more accurate. Furthermore, the rotation is used to deal with the trajectory problem of charged particles moving in a composite field, eliminating the need to draw multiple circles on the same graph, making the drawing clearer. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the first embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of the fixed-point component in this application;

[0028] Figure 3 This is a schematic diagram of the structure of the second embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the working state structure of the first embodiment of this application;

[0030] Figure 5 This is a schematic diagram illustrating the working principle of the first conventional solution method in the prior art;

[0031] Figure 6This is a schematic diagram illustrating the working principle of the second conventional solution in the prior art.

[0032] In the diagram: 100, protractor body; 200, protrusion block; 300, positioning component; 301, sleeve; 301-1, limiting groove; 302, positioning post; 303, spring; 304, cone; 305, snap-fit ​​block; 306, limiting point. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1: As Figure 1-2 As shown, this utility model provides a technical solution: a magnetic deflection trajectory teaching protractor, including a protractor body 100 for representing the magnetic deflection trajectory. A protrusion 200 can be provided at either end of the protractor body 100. The protrusion 200 can be integrally formed with the protractor body 100, or it can be fixed in other ways, such as snap-fit. A fixed point component 300 is also provided along the protrusion 200 to determine the deflection trajectory of the protractor body 100. The center of the fixed point component 300 is tangent to the edge of the protractor body 100.

[0035] Among them, such as Figure 2 As shown, the positioning component 300 includes a sleeve 301 that rotates to be disposed inside the protrusion 200. By fixing the sleeve 301, the protractor body 100 can rotate around the sleeve 301. Therefore, a positioning post 302 is provided vertically inside the sleeve 301. The lower end of the positioning post 302 is a cone 304, which can better fix the point. When in use, the positioning post 302 can be pressed down until the cone point of the cone 304 is fixed on the paper. This can prevent the positioning post 302 from shifting. In order to ensure that the cone 304 does not leak outside the sleeve 301 and avoid injury to the user, a spring 303 is also provided in the movable groove opened in the sleeve 301. The positioning post 302 also includes a locking block 305. The lower end of the locking block 305 and the upper end of the spring 303 are in contact with each other so that the positioning post 302 can be reset.

[0036] Furthermore, such as Figure 2As shown, limiting points 306 are also fixedly provided on both sides of the snap-fit ​​block 305, and limiting grooves 301-1 are also provided on the inner wall of the sleeve 301 and the limiting points 306, so that the limiting points 306 can slide along the limiting grooves 301-1 to prevent relative rotation between the fixed point column 302 and the sleeve 301.

[0037] The protractor is used as follows: Figure 4 As shown, in actual teaching, for example, particles emitted from the same point with the same speed can have different trajectories due to different speed directions, especially critical problems and range problems;

[0038] A common physics problem is as follows: A uniform magnetic field exists in a vacuum chamber, with the magnetic field direction perpendicular to the paper and pointing inwards. The magnitude of the magnetic induction intensity is B = 0.60T. Inside the magnetic field is a flat photosensitive plate ab, with the plate surface parallel to the direction of the magnetic field. At a distance l = 16cm from ab, there is a point-shaped alpha radiation source S, which emits alpha particles in all directions. The velocity of the alpha particles is v = 3.0 × 10⁶ m / s. Given the charge-to-mass ratio of the alpha particles, and considering only the alpha particles moving in the plane of the paper, find the length of the area on ab hit by the alpha particles.

[0039] The above problem requires the following analysis: The particle is positively charged, so it undergoes uniform circular motion in a counterclockwise direction in the magnetic field. Let R represent the orbital radius. Substituting the values, we get R = 10 cm. It can be seen that because... Figure 4 The distance between the middle S-axis and the ab-axis is smaller than the radius of the protractor.

[0040] Therefore, a larger figure can be drawn on the draft paper, making the distance between S and ab greater than the radius of the protractor. Since the circular trajectories of particles emitted in different directions all pass through S, the cone 304 in the fixed-point component 300 of the protractor in this application is made to coincide with point S, that is, the cone 304 part on the fixed-point post 302 is exposed, so that the cone 304 part is fixed at point S, which is used to ensure that the protractor body 100 does not move during the rotation. Then, the protractor body 100 itself is rotated (e.g., Figure 4 This makes it easy to determine that the left boundary is the point of tangency between the trajectory and ab, and the right boundary is the point where the diameter of the trajectory intersects ab. (e.g.) Figure 4 ).

[0041] Example 2: The difference from Example 1 is that, as Figure 3 As shown, in actual use, the trajectory of the other half of the particle cannot be observed during the user's rotation. Therefore, the applicant proposes a second embodiment, which involves splicing together two sets of protractor bodies 100 to create a structure as shown... Figure 3 The full-circle protractor was designed to address the aforementioned issues.

[0042] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A magnetic deflection trajectory teaching protractor, characterized in that, include: The protractor body (100) has a protrusion (200) at one end and a fixing component (300) on the inner side of the protrusion (200). The center of the fixing component (300) is tangent to the edge of the protractor body (100). When the fixing component (300) is fixed, the protractor body (100) can rotate along the axis of the fixing component (300) to display the magnetic deflection trajectory of the particles.

2. The magnetic deflection trajectory teaching protractor according to claim 1, characterized in that: The protrusion (200) is integrally formed on the protractor body (100).

3. The magnetic deflection trajectory teaching protractor according to claim 1, characterized in that: The positioning assembly (300) includes a sleeve (301) that is rotatably inserted into the inside of the protrusion (200).

4. A magnetic deflection trajectory teaching protractor according to claim 3, characterized in that: The inner side of the sleeve (301) is also provided with a fixed column (302) that moves up and down.

5. A magnetic deflection trajectory teaching protractor according to claim 4, characterized in that: The lower end of the fixed column (302) is a cone (304).

6. A magnetic deflection trajectory teaching protractor according to claim 4, characterized in that: The fixed post (302) also includes a snap-fit ​​block (305), and a spring (303) is provided inside the sleeve (301). The upper end of the spring (303) is in contact with the lower end of the snap-fit ​​block (305).

7. A magnetic deflection trajectory teaching protractor according to claim 6, characterized in that: The locking block (305) is also symmetrically fixed with limiting points (306) on both sides. The inner wall of the sleeve (301) and the limiting points (306) are also respectively opened with limiting grooves (301-1). The limiting points (306) move linearly along the limiting grooves (301-1).

8. A magnetic deflection trajectory teaching protractor according to claim 1, characterized in that: The protractor body (100) is made of acrylic sheet.

9. A magnetic deflection trajectory teaching protractor according to claim 1, characterized in that: The magnetic deflection trajectory teaching protractor is a semicircle formed by a set of the protractor bodies (100).

10. A magnetic deflection trajectory teaching protractor according to claim 9, characterized in that: The magnetic deflection trajectory teaching protractor is a full circle formed by two sets of the protractor bodies (100).

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