With the help of a neat diagram describe how you can generate induced current in a circuit.

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 our daily life we use two types of electric current whose current-time graphs are given below :

(i) Name the type of current in two cases.

(ii) Identify any one source for each type of current.

(iii) What is the frequency of current in case (b) in our country?

(iv) On the basis of these graphs, list two differences between the two currents.

(v) Out of the two which one is used in transmitting electric power over long distances and why?

(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.

(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.