Q.
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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a
B ωR2/2
b
2 B ωR2
c
is variable
d
None of these
answer is B.
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Detailed Solution
e=12Bl2ω=12B2r2ω=2Br2ω
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