why does a needle got deflected when brought near a bar magnet?
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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.
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The needle of a compass gets deflected when brought near to a bar magnet because ,The compass already shows the direction of magnetic field around the earth but when a bar magnet is brought near the magnet produces it's own magnetic field lines when interfere with that of earths therefore the compass is not able to show the right direction and gets deflected
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