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A conducting ring of radius r is placed ...

A conducting ring of radius r is placed perpendicular inside a time varying magnetic field as shown in figure. The magnetic field changes with time according to `B = B_0 + alphat` where `B_0` and `alpha` are positive constants. Find the electric field on the circumference of the ring.

A

`- pi alpha^2 r^2`

B

` - pi a^2 r`

C

` - pi alpha r^2`

D

`- pi alpha r`

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