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Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet

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asked Jan 24, 2018 in Physics by Kundan kumar (49,132 points) ● 34 ● 378 ● 1010

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?

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answered Jan 24, 2018 by Vikash Kumar (144,729 points) ● 8 ● 11 ● 21
selected Jan 24, 2018 by Kundan kumar
 
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Current-carrying loops behave like bar magnets and both have their associated field lines. This modifies the already existing earth's magnetic field and a deflection results.

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