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Specific electric charge of electron | Charge of electron by J.J. Thomson

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Illustrate JJ Thomson's method of finding the specific electric charge (E / M) of an electron?

To find the ratio of charge and mass (e / m) of electron by J.J. Thomson

J.J. Tamson used the fact that the electron beam can be projected by magnetic and electric fields to find the value of the specific charge (e/m) of an electron.

Composition

It has a long immersion tube of glass. At the left end of this tube, there is a porous anode attached to the cathode and some distance further away from the cathode, the vacuum is generated in the tube up to about 10 power minus 2 mm pressure. Inside the tube, there are two parallel plates of metal between which the electric potential constant is used uniformly in the paper floor at which place the magnetic field perpendicular to the bottom of the paper goes. At this place magnetic field is generated by placing an electromagnet perpendicular to the bottom of the paper outside the tube, zinc sulfide is coated on the wide part of the immersion tube.

Theory and procedure 

When about 1000 volts are split between the cathode and the anode, the electrons from the cathode go towards the anode and after coming out of the hole in the anode, they move along the straight line and fall on the reflective screen, thus generating the reflection Bright light point appears.

Specific electric charge of electron

When a charged particle does not have an electric or magnetic field superimposed on the electron, the charged particle moves in a straight line to produce light at the points of the fluorescent curtain, but when a charged magnetic field is applied perpendicular to its motion, each electron has a magnetic field. The magnetic force begins to work as soon as the electron enters the magnetic field, its path becomes circular.


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