A current-carrying rectangular loop is placed | vedclass

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(D) The magnetic field produced by the long straight wire is perpendicular to the plane of the rectangular loop at all points. According to the right-

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(D) The magnetic field produced by the long straight wire is perpendicular to the plane of the rectangular loop at all points. According to the right-hand rule,the magnetic force on each of the four sides of the loop lies within the plane of the loop itself. Since all the forces acting on the sides of the loop are coplanar and their lines of action pass through the plane of the loop,the net torque about any axis in the plane of the loop is zero. Therefore,the net torque acting on the loop is $0$.

$A$ current-carrying rectangular loop is placed near a straight infinitely long current-carrying wire as shown in the figure. The torque acting on the loop is

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