Which of the following statements is/are true for a DC motor?
(i) The function of the split rings is to reverse the flow of current.
(ii) Maximum force is experience by arms of the coil aligned parallel to the magnetic field
(iii) Reversing current after every half rotation leads to continuous rotation of the coil.

Correct option is D

The Correct Answer (d) Both (i) and (iii) In a DC motor, the following principles apply:
1. Split Rings: The split rings, also known as a commutator, reverse the direction of current after every half rotation of the coil. This ensures that the torque on the coil is always in the same direction, allowing continuous rotation.
2. Continuous Rotation: Reversing the current after every half rotation allows the coil to keep rotating in the same direction, providing a consistent motion in the motor.
3. Magnetic Force: Maximum force is experienced by the arms of the coil when they are perpendicular to the magnetic field, not when they are parallel.
Key Points:
· (i): Correct. Split rings reverse the current flow to maintain rotation.
· (ii): Incorrect. Maximum force occurs when the coil is perpendicular to the magnetic field, not parallel.
· (iii): Correct. Reversing the current after every half rotation leads to continuous rotation.