Question

4.
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Why does a compass needle show deflection
when brought near a bar magnet? [2008] ... [2M]
5.
A coil of insulated wire is connected to a
galvanometer. What would be seen if a bar
magnet with its north pole towards one face of
the coil is
(1) Moved quickly towards it,
(ii) Moved quickly away from the coil and
(iii) Placed near its one face?
Name the phenomena involved. ​

Answer 1

Answer:

4. The compass needle is a small magnet. That’s why when a compass needle is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle gets deflected near the magnet bar.

5.( i)

hope it helps

Answer 2

Answer:

4. The compass needle acts as a small magnet. That's why when a compass needle is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle gets deflected near the magnet bar.

5. 1) Moved quickly towards it- the galvanometer needle gets deflected towards the north pole of the magnet.

(ii) Moved quickly away from the coil- the deflection would be observed in opposite direction.

(iii) Placed near its one face-  If the magnet is held stationary inside the coil, the deflection of the galvanometer is zero.

The phenomenon is electromagnetic induction

Explanation: