A motor coil coasts past the position of zero torque and nothing else is changed. What does the torque then do?

1. Past the zero-torque position the angle theta changes sign, and so does sin(theta). 2. The torque therefore reverses its direction once the coil rotates past that point. 3. A reversed torque pulls the coil back toward the same equilibrium position. 4. Left alone, the coil would simply oscillate back and forth instead of turning. 5. This is exactly the problem that a motor has to solve to keep spinning one way. _Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.8 Torque on a Current Loop: Motors and Meters_