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Q.

Alternating current can not be measured by dc ammeter because

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a

ac cannot pass through dc ammeter

b

Average value of complete cycle is zero

c

ac is virtual

d

ac changes its direction

answer is B.

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Detailed Solution

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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