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JEE Main levelOne or more correct optionsDifficulty 2 of 3as031

Which statements about cathode rays are correct?

  1. AThey travel in straight lines and cast shadows of objects placed in their path
  2. BTheir charge-to-mass ratio changes with the gas filled in the tube
  3. CThey are deflected towards the positive plate in an electric field
  4. DThey are electromagnetic waves and are unaffected by magnetic fields

Answer: A, C

Cathode rays are negatively charged particles (electrons): they move in straight lines (shadows), bend towards the positive plate, and are deflected by magnetic fields. Their e/m is the same for any gas, so the second and fourth statements are wrong.
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