Alternating current can not be measured by dc ammeter because
[AIEEE 2004]

ac cannot pass through dc ammeter

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Average value of complete cycle is zero

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ac is virtual

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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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Alternating current can not be measured by dc ammeter because

[AIEEE 2004]

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