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If we imagine a man is swimming along the wire in the direction of current with his face always turned towards the needle ,so that the current enters trough his feet and leaves at his head, then the north pole of magnetic needle will be deflected towards his left hand .this rule can be recollected with the help of the word snow..

snow - current flowing from south to north over magnetic field then deflection of compass or needle is towards west..

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12y ago

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