Two coils of insulated copper wire are wound over a non-conducting cylinder as shown. Coil 1 has comparative large number of turns. State your observations, when(i) Key K is closed.(ii) Key K is openedGive reason for each of your observations.

Two coils of insulated copper wire are wound over a non-conducting cyl

1.	Two coils of insulated copper wire are wound over a non-conducting cylinder as shown. Coil 1 has comparative large number of turns. State your observations, when(i) Key K is closed.(ii) Key K is openedGive reason for each of your observations.
Answer» Solution :(i) When key K is closed, GALVANOMETER G gives a momentary deflection in a particular direction. On closing key K, a current starts flowing through coil 1 and a magnetic field is produced. As magnetic field linked with coil 2 increases, an induced voltage is SET up for a moment in coil 2 due to phenomenon of ELECTROMAGNETIC induction. (ii) On opening key K, the galvanometer G again gives a momentary deflection WHOSE direction is opposite to that in (i). On opening key K current flowing through coil 1 stops and so magnetic field of coils decreases. As a result, again an induced voltage is obtained in coil no 2.