Permanent magnet moving coil instrument can be used for

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Permanent magnet moving coil instrument can be used for:

  1. AC
  2. DC
  3. Both of these
  4. None of these

Correct answer: 2. DC only

Since the alternating current varies with time, this variation of current also changes the torque of coil. However, the pointer of PMMC can’t keep on fast reverse and is thus not suitable enough to be employed with AC. Therefore the Permanent magnet moving coil instrument can be used for d.c only.

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