A student configures a laboratory model of a direct current (d.c.) motor. A rectangular copper coil is placed between the opposite poles of a permanent magnet. The coil is connected to a d.c. power supply through a switch.
Explain why the coil begins to rotate when the switch is closed.
State one way to: reverse the direction of rotation of the coil.
State one way to: increase the speed of rotation of the coil.