Question

why compass neddle deflect in mid Indian ocean

Answer 1

In mid Indian Ocean there are many magnetic rocks and sunk ships under the surface of the water so due to that compass needle deflects

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Answer 2

Answer:

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.