The coil in the figure carries current i = 1.70 A in the direction indicated, is parallel to an xz plane, has 4 turns and an area of 5.64 Ã? 10-3 m2, and lies in a uniform magnetic field B = (1.72i - 2.78j - 4.44k) mT.
(a) What is the magnetic potential energy of the coil-magnetic field system?
(b) What is the magnetic torque (in unit-vector notation) on the coil?