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A uniform circular loop of radius a and ...

A uniform circular loop of radius a and resistance `R` palced perpendicular to a uniform magnetic field `B`. One half of the loop is rotated about the diameter with angular velocity `omega` as shown in Fig. Then, the current in the loop is

A

zero, when `theta` is zero

B

`(pia^(2)Bomega)/(2R)`, when `theta` is zero

C

zero, when `theta=pi//2`

D

`(pia^(2)Bomega)/(2R)`, when `theta=pi//2`

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Flux charges due to rotation of the semi-circle.
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