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The deflection sensitivity of a cathode ray tube is expressed in

  • A.volts per second
  • B.millimetres per second of sweep across the face of the screen
  • C.millimetres per volt
  • D.volts per millimetre

Answer: C

Sensitivity is the deflection produced per volt applied to the plates, so its unit is a length divided by a voltage. Its reciprocal, volts per millimetre, is called the deflection factor, and confusing the two is a standard examination trap.

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