College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 39

A rectangular loop consists of 100 closely wrapped turns and has dimensions 0.400 m by 0.300 m. The loop is hinged along the y -axis, and the plane of the coil makes an angle of 30.0° with the x -axis (Fig. P19.28). What is the magnitude of the torque exerted on the loop by a uniform magnetic field of 0.800 T directed along the x -axis when the current in the windings has a value of 1.20 A in the direction shown What is the expected direction of rotation of the loop