PHYSICS · Multi-part · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current
Problem
In the laboratory model of a d.c. motor, a split-ring arrangement is connected to the ends of the coil.
(a) What is meant by a split-ring commutator? Draw a simple diagram to illustrate your answer.
(b) Explain clearly how the split-ring commutator helps the coil to continue rotating in the same direction although the forces on its sides change direction every half-turn.
(c) Describe what would happen to the motion of the coil if the split-ring were replaced by two continuous slip rings while keeping every other part of the set-up the same. Give reasons.
(d) State two practical advantages gained by using a soft iron core inside the coil of a motor.