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A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plne perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of `1mm s^(-1)` . The induced emf when the radius is 2 cm, is

A

`2pi mu V`

B

`pimuV`

C

`(pi)/2 mu V`

D

`2muV`

Text Solution

Verified by Experts

The correct Answer is:
B
Magnetic flux `phi=B.A =B pi r^(2)`
`EMF |e| =(dphi)/(dt)=Bpi2r (dr)/(dt) =pimuV`
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