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Q.

A circular metal plate of radius R is rotating with a uniform ω angular velocity  with its plane perpendicular to a uniform magnetic field B. Then the emf developed between the centre and the rim of the plate is

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a

πωBR2

b

ωBR2

c

πωBR2/2

d

ωBR2/2

answer is D.

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Detailed Solution

motional emf of a disc or wheel =ε=12ωR2B
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