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A circular metalic disc of radius a is r...

A circular metalic disc of radius a is rotating with a uniform angular velocity (w) perpendicularly to the uniform magnetic field `vecB`. The potential difference between the centre and the rim of the disc is—

A

`(w^2Ba^2)/2`

B

`(w^2Ba)/2`

C

`(wBa^2)/2`

D

`(wB)/(2a^2)`

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