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.