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The electron gun of a cathode ray tube produces

  • A.a focused beam of electrons
  • B.the sawtooth voltage that sweeps the beam across the screen horizontally
  • C.the high voltage needed by the deflection plates of the tube
  • D.the light emitted at the point where the beam strikes the screen

Answer: A

It comprises a heated cathode, a control grid and a set of anodes which accelerate and focus the electrons emitted. Everything downstream of the gun deflects that beam or displays where it lands; the gun itself only makes and shapes it.

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