A semicircular loop of radius \( \mathrm{R} \) is placed in a unifo...

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A semicircular loop of radius \( \mathrm{R} \) is placed in a uniform magnet ic fie ld \( \mathrm{B} \) as shown. It is pulled with
\( \mathrm{P} \) a constant velocity. The induced emf in the loop is:
(1) \( \mathrm{Bv}(\pi \mathrm{R}) \cos \theta \)
(2) \( \operatorname{Bv}(\pi \mathrm{R}) \sin \theta \)
(3) \( \operatorname{Bv}(2 \mathrm{R}) \cos \theta \)
(4) \( \operatorname{Bv}(2 \mathrm{R}) \sin \theta \)
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