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Solution


Q.

Read the passage given below and answer the following questions from (i) to (v).

A current-carrying wire produces a magnetic field around it. The phenomena in which an electromotive force and current are induced by changing magnetic field through it is called induced current. It can be concluded that the induced current flows in a conductor as long as the magnetic force changes within the conductor. For the motion of the coil with respect to the magnet or vice versa, the direction of the current flowing in the conductor is determined by the direction of the relative motion of the conductor with respect to the magnetic field. The induced emf or current is directly proportional to the rate of change in the magnetic field.

(i) What is the condition of electromagnetic induction
1 There must be relative motion between galvanometer and coil of wire.  
2 There must be a relative motion between galvanometer and magnet.  
3 There must be a relative motion between galvanometer and electric motor.  
4 There must be a relative motion between the coil of wire and a magnet.  

Ans.

(4)