a Look at this situation in the frame of the plate By consid

(a) Look at this situation in the frame of the plate. By considering some fixed Amperian loops in the plate, argue qualitatively that the passing magnet must induce electric currents in the plate and that these currents will oppose the motion of the passing magnet. (Such currents are called eddy currents.)

Solution

a)

According to ampere\'s Law

int B.dL = u0I

we can take a situation where a plate is placed in a magnetic field down the plane of the paper and changing

So , induced emf = -d(phi)/dt

due to the induced emf current is induced and its direction will be such that it would oppose the cause