The coil is connected to a split-ring commutator
When current flows through the coil, the force acting on the coil will turn the coil in a clockwise direction until the coil is in the vertical position
There is no current flowing in the vertical position, but due to its momentum, the coil continues to rotate past the vertical position
This reverses the direction of current in the coil. Thus, the coil continues to rotate in a clockwise direction
The purpose of the split-ring commutator is to reverse the direction of current in the coil whenever the commutator changes its contact from one carbon brush to another, this ensures that the coil will rotate in a fixed direction
Turning effect of the wire coil increased when
the number of turns of the coil of wire is increased
the current is increased
the coil of wire is wound on a soft-iron core