PHYSICS · Single correct · GCSE · Physics · Magnetism and Electromagnetism · Magnetism and Electromagnetism
Problem
In an electric motor, the split-ring commutator reverses the current in the coil every half turn. If the commutator gets stuck and fails to reverse the current after a half turn, what is most likely to happen to the motion of the coil?
(a) It will continue to rotate in the same direction steadily
(b) It will instantly start rotating in the opposite direction
(c) It will slow down and swing back, oscillating about a mean position
(d) It will complete one more half turn due to inertia and then come to rest