A semicircular wire of radius R is rotated with constant angular velocity ω 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:

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B ωR2/2

2 B ωR2

is variable

None of these

answer is B.

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Detailed Solution

e=12Bl2ω=12B2r2ω=2Br2ω

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