S

Sandhya Thakur • 1.97K Points
Master Physics 

Q. Which one of the following is the main cause of magnetic decay in PMMC type instrument ?

  • (A) Variation in the resistance of the moving coil
  • (B) Quality of spring
  • (C) Aging of the spring
  • (D) Aging of the magnets
Correct Answer - Option(D)

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