Make a drawing in your notebook and use RHR-2 to find the direction of the magnetic field of a current loop in a motor (such as in the figure below). Then show that the direction of the torque on the loop is the same as produced by like poles repelling and unlike poles attracting.

Figure 1. Torque on a current loop. A current-carrying loop of wire attached to a vertically rotating shaft feels magnetic forces that produce a clockwise torque as viewed from above.