What are the application of electromagnetic induction?
Important Questions on Magnetism
(a) What is electromagnetic induction?
(b) Explain the various methods of producing induced current.
(c) State the rule which gives the direction of induced current.
(d) Name two devices which work on the principle of electromagnetic induction.
A bar magnet is attached to a spring on a smooth horizontal surface as shown in the figure. The bar magnet is displaced and left such that it starts oscillating. A coil is placed with a galvanometer attached to it. What observation will be seen in the deflection of a galvanometer? Which phenomenon is responsible for the observation?
In the arrangement shown in figure there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then
(i) Two circular coils P and Q are kept close to each other, of which coil P carries a current. If coil P is moved towards Q, will some current be induced in coil Q? Give reason for your answer and name the phenomenon involved.
(ii) What happens if coil P is moved away from Q?
(iii) Briefly explain any two methods of inducing current in a coil.
(a) Describe briefly one way of producing an induced e.m.f.
(b) State one factor that determines the magnitude of induced e.m.f. in part (a) above.
(c) What factor determines the direction of induced e.m.f. in part (a) above?
