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Which of the following statements about cathode rays is correct?

  1. ATheir charge-to-mass ratio depends on the gas in the discharge tube
  2. BThey are deflected towards the positive plate in an electric field
  3. CThey are electrically neutral
  4. DThey are not affected by a magnetic field

Answer: B

Cathode rays are streams of electrons, so they bend towards the positive plate in an electric field and are also deflected by magnetic fields. Their e/m value is the same for every gas and electrode material.
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