Question

Why does a magnetic compass needle pointing north and south in the absence of a nearby magnet get deflected when a bar magnet or a current carrying loop is brought near it. Describe some salient features of magnetic lines of field concept?

Answer 1

Magnetic field is created by a bar magnet or a current carrying conductor.Due to the presence a magnetic field the magnetic needle shows deflection

FEATURES of magnetic field line

1] they do not intersect

2 they emerge from north and merge in south outside the magnet

3 inside field lines emerge from south

4 the are vector quantity

5 they are crowded  at poles and have greater strength there

hope its helpful enough...

Answer 2

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The $\sf{\bold{compass\:needle}}$ is a small magnet. When the compass needle is brought close to a bar magnet, the magnetic field lines of the compass needle interact with the magnetic field lines of bar magnet, which causes the compass needle to deflect.

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