Which of the following is correct for cathode rays in discharge tube?

Independent of the nature of the cathode

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Independent of the nature of the gas

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Is observed in presence of electric and magnetic field

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All of the above

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Solution

The correct option is D All of the above
The cathode rays are independent of the cathode material as well as independent of the gas used in the discharge tube. All gases have the same value for $e / m$ ratio in case of cathode rays. It is also observed in the magnetic and electric field.
Hence, the option $D$ is correct.

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