Permanent magnet type instrument may be used for -
- A.A.C. only
- B.D.C. only
- C.Impulse quantities
- D.A.C. and D.C. both
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only. In a permanent magnet moving coil instrument the coil is pivoted in the field of a permanent magnet, so the deflecting torque is proportional to the current itself and not to its square.
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