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The deflection sensitivity of a cathode ray tube can be increased by

  • A.increasing the accelerating voltage
  • B.increasing the separation between the two deflecting plates
  • C.shortening the distance from the plates to the screen
  • D.reducing the accelerating voltage

Answer: D

Sensitivity is proportional to the plate length and the tube length and inversely proportional to the plate separation and the accelerating voltage. A slower electron spends longer between the plates and is deflected further, so a lower accelerating voltage gives more deflection.

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