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a conducting loop of radius R is precent...

a conducting loop of radius `R` is precent in a uniform magnetic-field `B` perpendicular the plane of the ring. If radius `R` varies as a function of time 't', as `R_(0)+t`. The e.m.f induced in the loop is

A

`2pi(R_(0)+t)B` clockwise

B

`pi(R_(0)+t)B` clockwise

C

`2pi(R_(0)+t)B` anticlockwise

D

zero

Text Solution

Verified by Experts

The correct Answer is:
C
`phi=BA implies phi=B.piR`
`phi=Bpi(R_(0)+t)^(2)`
`(dphi)/(dt)=Bpi 2(R_(0)+t)`
`e=2piB(R_(0)+t)`
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