The ratio of $e / m$ for a cathode ray:

varies with a gas in a discharge tube

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is fixed

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varies with different electrodes

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is maximum if hydrogen is taken

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Solution

The correct option is B is fixed
The ratio of e/m for a cathode ray is fixed at $1.758820 \times 10^{11} C / k g$ . It is equal to the ratio of e/m for an electron. This is because cathode rays consists of electrons.
Note: In e/m, e refers to charge and m refers to mass.

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