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A permanent magnet moving coil instrument responds to

  • A.the peak value of the current through it
  • B.the frequency of the current through it
  • C.the average value of the current through it
  • D.the root mean square value of the current through it

Answer: C

The torque follows the instantaneous current and the inertia of the moving system averages it, so on an alternating current of zero mean the pointer does not move at all. That is why such an instrument is a direct current instrument only.

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