The north pole of a magnet is brought down along the axis of a horizontal circular coil . As a result, the flux through the coil changes from 0.35 weber to 0.85 weber in an interval of half a second. Find the average emf induced during this period. Is the induced current clockwise or anticlockwise as you look into the coil from the side of the magnet?

Explanation

Here ` phi_1=0.35 weber,`
` phi_2=0.85 weber.`
`d phi= phi_2-phi_1`
`=(0.85-0.35)weber`
`=0.5 weber, dt=0.5 sec`
`e=(d phi)/(dt)=(0.5)/(0.5)=1 V`
`the induced current is anticlockwise as seen from above .