A) ac cannot pass through dc ammeter
B) Average value of complete cycle is zero
C) ac is virtual
D) ac changes its direction
Correct Answer: B
Solution :
[b] In dc ammeter, a coil is free to rotate in the magnetic field of a fixed magnet. If an alternating current is passed through such a coil, the torque will reverse its direction each time the current changes direction and the average value of the torque will be zero.
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