Determination of e/m of electron by magic eye method

[kpstp88]

tell me how to perform this experiment and please post the figure of its apparatus.

 

[jtbell]

I don't know what you mean by "magic eye method." Why do you want to know? Do you need to actually perform this experiment? Have you been given an assignment to find out about it? Do you have any information or clues about it at all?

 

[baba89]

The determination of e/m of electron by the magic eye method is a classic experiment in the field of physics. This method was first proposed by J.J. Thomson in 1897 and has been used to accurately measure the charge-to-mass ratio of an electron.

To perform this experiment, the following apparatus is required:

1. A vacuum tube: This is a glass tube with a cathode at one end and an anode at the other end. The tube is filled with a low-pressure gas, such as air or helium.

2. A power supply: This is used to provide a high voltage between the cathode and anode, creating an electric field inside the tube.

3. A magnetic field source: This can be a permanent magnet or an electromagnet, which is used to produce a uniform magnetic field inside the tube.

4. A magic eye tube: This is a special type of vacuum tube with a fluorescent screen at one end and a metal plate at the other end.

The experiment is performed as follows:

1. The vacuum tube is set up on a flat surface, with the cathode facing the magnetic field source.

2. The power supply is turned on, and a high voltage is applied between the cathode and anode, creating an electric field inside the tube.

3. The magnetic field source is turned on, producing a uniform magnetic field inside the tube.

4. The magic eye tube is placed near the anode, with the fluorescent screen facing the anode.

5. The magnetic field is adjusted until the electron beam inside the tube is deflected and hits the fluorescent screen.

6. The position of the electron beam on the screen is marked and the magnetic field is changed.

7. Steps 5 and 6 are repeated for different values of the magnetic field.

8. The distance between the marked positions of the electron beam on the screen is measured for each magnetic field value.

9. The charge-to-mass ratio of the electron (e/m) is calculated using the following formula:

e/m = 2V / (B^2d^2)

where V is the voltage applied, B is the magnetic field strength, and d is the distance between the marked positions on the screen.

The figure of the apparatus for this experiment is attached below:

[INSERT FIGURE HERE]

In conclusion, the determination of e/m of electron by the magic eye method is a simple yet accurate experiment that has been used for over a century to measure the