Q.

What reading would you expect of a square wave current, switching rapidly between +0.5A and -0.5A, when passed through an ac ammeter?

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a

Zero

b

0.5A

c

0.25A

d

1.0A

answer is B.

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Detailed Solution

(0.5)2R(T2)+(0.5)2R(T2)=Imax2RT Imax=12A=0.5A
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What reading would you expect of a square wave current, switching rapidly between +0.5A and -0.5A, when passed through an ac ammeter?