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In a.c. circuit, the instantaneous value of e.m.f. and current are

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In a.c. circuit, the instantaneous value of e.m.f. and current are
A. 100 W
B. 75 W
C. 50 W
D. 25 W
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Correct Answer - C
`P_(av)= (E_(0)I_(0)cos theta)/2 = (100 xx 2)/2 xx cos 60^(@) = 50 W`.
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