Lorentz force demonstration device

Abstract

The utility model provides a Lorentz force demonstration device, a horizontally arranged cathode-ray tube is arranged on a table top, two ends of the cathode-ray tube are fixedly connected to a supporting seat and are connected with an electrode wire, a vertically arranged horseshoe-shaped magnet is arranged beside the cathode-ray tube, and the horseshoe-shaped magnet is connected with the cathode-ray tube. An opening of the horseshoe-shaped magnet faces the cathode-ray tube, an electron beam in the cathode-ray tube deflects under the action of the horseshoe-shaped magnet, and the driving unit drives the horseshoe-shaped magnet to translate along the length direction of the cathode-ray tube so as to demonstrate the influence of Lorentz force on the motion trail of the electron beam.

Description

Technical Field

[0001] The utility model belongs to the field of electromagnetic demonstration equipment, and in particular relates to a Lorentz force demonstration device. Background Art

[0002] In electromagnetism, under the influence of a high voltage between the cathode and anode, an electron beam emitted from the cathode can bombard a long fluorescent plate, stimulating fluorescence, and the trajectory of the electron beam's motion is displayed on the fluorescent plate. In the absence of an external magnetic field, the electron beam travels in a straight line. However, if a cathode ray tube is placed between the poles of a horseshoe-shaped magnet, the trajectory of the electron beam displayed on the fluorescent screen becomes curved. By observing the deflection of cathode rays in the magnetic field, the force felt by charged particles moving in the electromagnetic field can be inferred. This is the Lorentz force demonstration experiment. Traditional demonstrations require equipment in the laboratory, making them inconvenient for display. Therefore, a demonstration device is needed to easily demonstrate the effect of the Lorentz force on the trajectory of the electron beam. Utility Model Content

[0003] The utility model provides a Lorentz force demonstration device, which aims to demonstrate the influence of the Lorentz force on the motion trajectory of an electron beam.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A Lorentz force demonstration device comprises a horizontally arranged cathode ray tube on a table, with both ends of the cathode ray tube fixedly connected to a support base and connected to electrode wires. A vertically arranged horseshoe magnet is provided beside the cathode ray tube, with an opening of the horseshoe magnet facing the cathode ray tube. The lower end of the horseshoe magnet is connected to a driving unit, which drives the horseshoe magnet to translate along the length of the cathode ray tube.

[0006] In the above scheme, a vertically arranged horseshoe magnet is provided beside the cathode ray tube, with the opening of the horseshoe magnet facing the cathode ray tube. The electron beam in the cathode ray tube will be deflected by the action of the horseshoe magnet. When the driving unit drives the horseshoe magnet to translate along the tube length of the cathode ray tube, the deflection point of the electron beam can be observed to move with the movement of the horseshoe magnet, which is intended to demonstrate the influence of the Lorentz force on the motion trajectory of the electron beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the top view of the structure of the utility model;

[0008] Figure 2 It is a side structural schematic diagram of the utility model;

[0009] Figure 3 It is a schematic diagram of the meshing of the gear and rack of the utility model. DETAILED DESCRIPTION

[0010] like Figures 1 to 3 A Lorentz force demonstration device is shown, wherein a horizontally arranged cathode ray tube 10 is provided on a table 1, both ends of the cathode ray tube 10 are fixedly connected to a support base 20 and both ends of the cathode ray tube 10 are connected to electrode wires, and a vertically arranged horseshoe magnet 30 is provided beside the cathode ray tube 10, with the opening of the horseshoe magnet 30 facing the cathode ray tube 10, and the lower end of the horseshoe magnet 30 is connected to a driving unit 40, which drives the horseshoe magnet 30 to translate along the tube length direction of the cathode ray tube 10.

[0011] In the above scheme, both ends of the cathode ray tube 10 are connected to electrode wires. The electron beam emitted from the cathode of the cathode ray tube 10 can bombard the elongated fluorescent plate to stimulate fluorescence. A horseshoe magnet 30 is arranged vertically on the side of the cathode ray tube 10. Under the action of the magnetic field of the horseshoe magnet 30, the electron beam is deflected by the Lorentz force. At this time, the driving unit 40 drives the horseshoe magnet 30 to translate along the tube length of the cathode ray tube 10. It can be observed that as the horseshoe magnet 30 moves, the deflection point on the fluorescent plate that stimulates fluorescence also moves accordingly, allowing the observer to understand the influence of the Lorentz force on the motion trajectory of the electron beam.

[0012] Furthermore, the drive unit 40 includes a rotating shaft 41, and a coaxially arranged gear 411 is provided at the lower end of the rotating shaft 41. The gear 411 is engaged with a rack 51. The length direction of the rack 51 is parallel to the tube length direction of the cathode ray tube 10. The free end of the transmission rod 50 forming a T-shaped or L-shaped connection with the rack 51 extends to the bottom of the horseshoe magnet 30 and is connected to the horseshoe magnet 30. The gear 411 at the lower end of the rotating shaft 41 is engaged with the rack 51 of the transmission rod 50 to form a gear-rack transmission. The observer can drive the horseshoe magnet 30 to translate along the tube length direction of the cathode ray tube 10 by rotating the rotating shaft 41.

[0013] Preferably, a slider 52 is fixedly provided on the transmission rod 50. A track 60 arranged along the tube length of the cathode ray tube 10 is provided on the inner surface of the table 1. The slider 52 and the track 60 form a sliding fit along the tube length direction of the cathode ray tube 10. The slider 52 on the transmission rod 50 and the track 60 of the table 1 form a sliding fit along the tube length direction of the cathode ray tube 10, which plays a guiding role and ensures that the horseshoe magnet 30 translates along the tube length direction of the cathode ray tube 10.

[0014] Furthermore, the free end of the transmission rod 50 is fixedly connected to the horseshoe magnet 30 via a connecting rod 70 . The upper portion of the connecting rod 70 is sleeved on the lower half of the horseshoe magnet 30 , and the lower end of the connecting rod 70 is fixedly connected to the transmission rod 50 .

[0015] In the above scheme, the free end of the transmission rod 50 is connected to the horseshoe magnet 30 via a connecting rod 70, ensuring that the horseshoe magnet 30 can translate along the tube length direction of the cathode ray tube 10. At the same time, the upper portion of the connecting rod 70 is sleeved on the lower half of the horseshoe magnet 30, so that the north and south poles of the horseshoe magnet 30 can be swapped, making it easier to observe the changes in the deflection direction of the electron beam on the fluorescent plate, so that the observer can understand the influence of the magnetic field direction on the deflection direction of the electron beam.

[0016] Preferably, in order to facilitate the observer to rotate the shaft 41 to drive the horseshoe magnet 30 to translate along the tube length direction of the cathode ray tube 10, a turntable 42 is provided on the upper end of the shaft 41, and a crank 43 is provided on the turntable 42.

[0017] Furthermore, a control switch 80 is provided on the table 1 , and the control switch 80 controls the opening and closing of the electrode wires at both ends of the cathode ray tube 10 , thereby realizing the opening and closing of the cathode ray tube 10 .

Claims

1. A Lorentz force demonstration device, characterized in that: A horizontally arranged cathode ray tube (10) is provided on a table top (1), two ends of the cathode ray tube (10) are fixedly connected to a support base (20) and two ends of the cathode ray tube (10) are connected to electrode wires, a vertically arranged horseshoe magnet (30) is provided beside the cathode ray tube (10), an opening of the horseshoe magnet (30) faces the cathode ray tube (10), and a lower end of the horseshoe magnet (30) is connected to a driving unit (40), and the driving unit (40) drives the horseshoe magnet (30) to translate along the tube length direction of the cathode ray tube (10).

2. The Lorentz force demonstration device according to claim 1, characterized in that: The driving unit (40) includes a rotating shaft (41), a coaxially arranged gear (411) at the lower end of the rotating shaft (41), the gear (411) meshing with a rack (51), the length direction of the rack (51) being parallel to the tube length direction of the cathode ray tube (10), and the free end of the transmission rod (50) forming a T-shaped or L-shaped connection with the rack (51) extending to the bottom of the horseshoe magnet (30) and connected to the horseshoe magnet (30).

3. The Lorentz force demonstration device according to claim 2, characterized in that: A slider (52) is fixedly provided on the transmission rod (50), and a track (60) arranged along the tube length of the cathode ray tube (10) is provided on the inner side surface of the table (1), and the slider (52) and the track (60) form a sliding fit along the tube length direction of the cathode ray tube (10).

4. The Lorentz force demonstration device according to claim 2, characterized in that: The free end of the transmission rod (50) is fixedly connected to the horseshoe magnet (30) via a connecting rod (70). The upper portion of the connecting rod (70) is sleeved on the lower half of the horseshoe magnet (30), and the lower end of the connecting rod (70) is fixedly connected to the transmission rod (50).

5. The Lorentz force demonstration device according to claim 2, characterized in that: A rotating disk (42) is provided at the upper end of the rotating shaft (41), and a crank (43) is provided on the rotating disk (42).

6. The Lorentz force demonstration device according to claim 1, characterized in that: A control switch (80) is also provided on the table (1), and the control switch (80) controls the opening and closing of the electrode wires at both ends of the cathode ray tube (10).

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