A current carrying wire in the neighborhood produces
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(c) Current means flow of electron in particular direction it does not charge the conductor hence outside wire electric field is zero and only magnetic field exists.
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A circular loop of radius $R$ carries a current $I$. Another circular loop of radius $r(< < R) $ carries a current $i$ and is placed at the centre of the larger loop. The planes of the two circles are at right angle to each other. Find the torque acting on the smaller loop.
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