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  4. In the J.J. Thomson method for the determination of e/m, what is the angle between the magnetic and electric fields to which the electrons are subjected ?

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Q. In the J.J. Thomson method for the determination of e/m, what is the angle between the magnetic and electric fields to which the electrons are subjected ?

Dual Nature of Radiation and Matter

Solution:

Electric force should be opposite to the magnetic force. This is possible when the angle between $\overrightarrow{E}$ and $\overrightarrow{B}$ is 90.