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A rectangular loop of sides a \& b is placed in magnetic field \( \mathrm{B} \). The emf induced in coil when
\( \mathrm{P} \) normal of coil makes angle \( \omega t \) with \( B \) :-

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(1) \( \mathrm{BA} \omega \cos \omega \mathrm{t} \)
(2) BA \( \mathrm{B} \omega \sin \omega \mathrm{t} \)
(3) \( -\mathrm{BA} \omega \sin \omega \mathrm{t} \)
(4) \( -\mathrm{BA} \omega \cos \omega \mathrm{t} \)
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