A square coil of side l= 10cm is mounted on a fixed insulating axis passing through the midpoints of a pair of opposite sides . A very long straight conductor parallel to the axis and at a distance of d= 12cm from it carries a current of 65A. When the coil is in the position in which its opposite sides parallel to the axis are equidistant from the long straight conductor , Find the torque acting on it if a current of 78A passes through it? 

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