A semicircular wire of radius \( R \) is rotated with constant angular velocity \( \omega \) abo...

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A semicircular wire of radius \( R \) is rotated with constant angular velocity \( \omega \) about an axis passing through one end and perpendicular to the plane of the wire. There is a uniform magnetic field of strength \( B \). The induced e.m.f. between the ends is
(a) \( B \omega R^{2} / 2 \)
(b) \( 2 B \omega R^{2} \)
(c) Variable
(d) None of these
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