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A uniform but time-varying magnetic fiel...

A uniform but time-varying magnetic field B(t) exists with in a circular region of radius a and is directed in to the plane of the paper as shown in the figure.
The magnitude of the induced electric field at the point P at a distance r from the centre of the circular region

A

is zero

B

decreases as `1 //r`

C

increases as r

D

decreses as `1 // r^2`.

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