JEE Main 2004 Physics question

Alternating current can not be measured by D.C. ammeter because

(1)A.C. cannot pass through D.C.
(2)A.C. changes direction
(3)average value of current for complete cycle is zeroCorrect
(4)D.C. ammeter will get damaged.

Answer: (3)

Solution

A moving-coil (D.C.) ammeter responds to the average current. For a sinusoidal A.C. the average over a complete cycle is zero, so the pointer shows zero (or just vibrates),

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Question ID VK-038345