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Quite often, connecting wires carrying c...

Quite often, connecting wires carrying currents in opposite directions are twisted together in using electrical appliances. Explain how it avoids unwanted magnetic fields.

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It is so because the magnetic field `vecB` at a point is a function of distance and direction of current. Twisting of wires eliminates the magnetic effects at a distant point because of the following reasons: (i) average distance is practically the same and (ii) current flows in the two wires in opposite directions.
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