A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the two halves of a commutator. Two carbon brushes ...

A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the two halves of a commutator. Two carbon brushes are made to press lightly against the commutator and when these are connected in a circuit with a battery and a rheostat, the coil rotates. This is a description of

Answer Details

The given description is of a D.C electric motor. It consists of a rectangular coil that can rotate in a magnetic field. When a current is passed through the coil, it experiences a force due to the interaction with the magnetic field. As a result, the coil rotates. The two ends of the coil are connected to the two halves of a commutator, and carbon brushes are made to press lightly against the commutator. The commutator allows the direction of the current to be reversed each time the coil passes a half-turn, ensuring that the coil continues to rotate in the same direction. This continuous rotation of the coil provides mechanical energy that can be used to perform work.