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Radius of a circular ring is changing wi...

Radius of a circular ring is changing with time and the coil is placed in uniform magnetic field perpendicular to its plane. The variation of 'r' with time 't' is shown in Fig. Then induced emf e with time t will be best represented by

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B
`e=(BdA)/(dt)=(Bd)/(dt)(pir^(2)) =B2pir(dr)/(dt)`
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