If the frequency of the source e.m.f. in an \( A C \) circuit is \(...

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If the frequency of the source e.m.f. in an \( A C \) circuit is \( n \), the power varies with a frequency :
(A) \( n \)
(B) \( 2 \mathrm{n} \)
(C) \( n / 2 \)
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