question_answer

Directions : (21-25)

The Experiments of Faraday and Henry

In year 1820 Oersted discovered the magnetic effect of current. Faraday gave the through that reverse of this phenomenon is also possible i.e., current can also be produced by magnetic field. Faraday showed that when we move a magnet towards the coil which is connected by a sensitive galvanometer. The galvanometer gives instantaneous deflection showing that there is an electric current in the loop.

Whenever relative motion between coil and magnet takes place an e.m.f. induced in coil. If coil is in closed circuit then current is also induced in the circuit. This phenomenon is called electromagnetic induction.

The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the North Pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was

A) moving towards the solenoid

B) moving into the solenoid

C) at rest inside the solenoid

D) moving out of the solenoid