Why does a compass needle placed near a current carrying wire show deflection?
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rahul746
The simplest explanation is that the needle aligns itself with the direction of the magnetic field lines. Since the lines are perpendicular to the direction of current, the needle will try to align that way also. It is only deflected west because Earth's magnetic field is still pulling the needle to point north
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anubhav35
because a current carrying wire has magnitude and a compass comes in the influence of the wire then the magnitude starts forcing on the compass so that's why it shows deflection
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