Describe the coil and barmagnet experiment to demonstrate the phenomenon of electromagnetic induction.

Explanation

Observations :
(i) When the bar magnet was at rest, the galvanometer showed no deflection
(ii) When north pole of the bar magnet moved towards the coil, galvonometer showed deflection in one direction indicating flow of current in the coil.
(iii) When north pole of the bar magnet moved away from the coil, galvonometer again showed the deflection but now in the opposite direction indicating flow of current in the coil but in the opposite direction. Conclusion :
i) Whenever there is a relative motion between a closed coil and a magnet induced emf is set up across the coil or induced current flows through the coil.
(ii) Induced current lasts in the coil so long as the movement of the magnet w.ut the coil continues