Question

Why does a compass needle get deflected when brought near a bar magnet 0?

Answer 1

A compass needle is a small bar magnet. When it is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle shows a deflection when brought near the bar magnet.

Answer 2

♤ Compass needle is a tiny pivoted magnet

♤ it experienced a force exerted by a magnetic field set due to a bar magnet.

♤ due to this magnetic force compass needle gets deflected when it is brought ear to a bar magnet.