H.C. VERMA -A GOOD QUESTION

the figure shows a circular coil of N turns and radius a connected to a battery E through a rheostat . the rheostat has length L and resistance R .the resistance of the coil is r . a circular loop of radius a' and resistance r' is placed coaxially with the coil. the centre of the loop is at a distance x from the centre of coil, in the beginning the sliding contact of rheostat slides from left to right at a speed v

FIND INDUCED EMF IN SMALLER CIRCULAR LOOP AT

a. the contact begins to slide

b. it has slid through half the length of the rheostat