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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 ...