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The deflection of the beam in a general purpose oscilloscope tube is

  • A.obtained by varying the potential of the accelerating anode
  • B.electrostatic
  • C.electromagnetic, coils outside the neck of the tube carrying the deflecting current
  • D.produced by tilting the whole electron gun within the envelope

Answer: B

Two pairs of plates inside the tube deflect the beam by the electric field between them. Electromagnetic deflection, with coils outside the neck, is used in television and radar tubes, where large deflection angles matter more than high frequency response.

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