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Consider a source which produces sinusoidally varying potential difference across its terminals, this potential difference called \( \mathrm{AC} \) voltage, be given by the expression
- (a) \( V_{m} \sin \omega t \)
(b) \( V_{m} \cos \omega t \)
- (c) \( 2 V_{m} \cos \omega t \)
(d) \( 2 V_{m} \sin \omega t \)
\( \mathrm{P} \)
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