Questions
A conducting loop of radius R is present in a uniform magnetic field B perpendicular to the plane of the ring. If radius R varies as a function of time t, as R = R0 + t. The emf induced in the loop is
detailed solution
Correct option is C
Given, R = R0 + tA=πR2=πR0+t2;dAdt=2πR0+tTherefore, emf induced in the loop ise=BdAdt=2πR0+tBSince area is increasing, induced emf is in anticlockwise sense to oppose the change in flux.Similar Questions
An elasticized conducting band r is around a spherical balloon T (figure). Its plane passes through the center of the balloon. A uniform magnetic field of magnitude 0.04 T is directed perpendicular to the plane of the band. Air is let out of the balloon at 100 cm3s-1 at an instant when the radius of the balloon is 10 cm. The induced emf in the band is
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