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Question

Alternating current can not be measured by dc ammeter because

A
ac cannot pass through dc ammeter
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B
Average value of complete cycle is zero
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C
ac is virtual
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D
ac changes its direction
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Solution

The correct option is B Average value of complete cycle is zero

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 it’s direction each time the current changes direction and the average value of the torque will be zero.


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