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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 The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly.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 solenoid c) at rest inside the solenoid d) moving out of the solenoid
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 The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly.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 solenoid c) at rest inside the solenoid d) moving out of the solenoid
CBSE | Class 10 | Lakhmir Singh | Magnetic Effects of Electric Current | Physics
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 The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly.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 solenoid c) at rest inside the solenoid d) moving out of the solenoid

Answer:

The correct option is d) moving out of the solenoid

Explanation:

The galvanometer displays no deflection when the bar magnet is fixed.

A galvanometer shows deflection when the north pole of the magnet is brought near the coil, showing that current is induced in the coil.

That is, if the magnet is maintained stationary for a few seconds and then rapidly withdrawn, the largest deflection of the galvanometer occurs when the magnet is moved out of the solenoid because the relative change in value of the magnetic field is maximum.

The galvanometer deflection lasts as long as the bar magnet moves.
The bar magnet will not deflect when kept stationary.
The galvanometer shows deflection in the opposite direction when the magnet is removed from the coil.

 

i

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