(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.
Important Questions on Magnetic Effects of Electric Current
(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.
Answer the following questions :
(i) What is the direction of magnetic field lines outside a bar magnet?
(ii) What is SI unit of magnetic field?
(iii) What does crowding of magnetic field lines indicate?
(iv) What is the frequency of A.C. in India?
(v) Name two organs in the human body where magnetic field is quite significant.
