1.

A long current carrying wire, carrying current such that it is flowing out from the plane of paper, is placed at O. A steady state current is flowing in the loop ABCD. Then,

Answer»

the net force is zero
the net torque is zero
as SEEN from O, the loop will rotate in CLOCKWISE DIRECTION ALONG axis OO'
as seen from O, the loop will rotate in anticlockwise direction along axis OO'

Solution :Net force on AB and CD will zero because magnetic field due to `I_1` is along these parts. Force on BC due to `I_1` will be outwards and on AD will be inward. This will provide clockwise torque as seen form O.


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