Why does a magnetic compass needle point...

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 silent features of magnetic lines of field concept.

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When a magnetic compass needle points North and South in the absence of a nearby magnet or a current loop, it is acting upon by the Earth's field only. But in the presence of a magnet or a current loop (which also has a magnetic field), the Earth's magnetic field near the compass is modified and the needle is deflected from N-S direction. For salient features of magnetic field lines.

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The magnetic field near a current carrying conductor is given by

Coulomb’s law

Lenz’ law

Biot-savart’s law

Kirchoff’s law

If a diamagnetic substance is brought near north and south pole of a bar magnet, it is

attracted by poles

repelled by poles

attracted by north pole and repelled

none of these

If a diamagnetic substance is brought near North or South pole of a bar magnet, it is

repelled by North pole and attracted by the South pole

repelled by the poles

attracted by the poles

attracted by the North pole and repelled by the South pole.