3. A square coil (side = 4 cm) with 12 turns lies in the xy- plane. Its sides are parallel to the axes and its center is at the origin. A constant and uniform magnetic field exists in the +y direction with B = 2.0T î. Calculate the current needed to produce a net torque about the x- axis of 1.92 x 10-³ N.m.

3. A square coil (side = 4 cm) with 12 turns lies in the xy- plane. Its sides are parallel to the axes and its center is at the origin. A constant and uniform magnetic field exists in the +y direction with B = 2.0T î. Calculate the current needed to produce a net torque about the x- axis of 1.92 x 10-³ N.m.