what does the deflection of a compass needle shows
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If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.
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A current carrying conductor produces a magnetic field around it. This magnetic field apply force on the magnetic needle of compass, and thus the needle shows deflection.
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