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Damping torque in an indicating instrument acts

  • A.in the same sense as the deflecting torque
  • B.only while the pointer is moving
  • C.at all times, whether the pointer moves or not
  • D.only when the pointer has come to rest

Answer: B

It depends on the velocity of the moving system, so it opposes the motion and dies away as the pointer settles, without shifting the final reading. Too little gives oscillation and too much gives a sluggish instrument.

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