A running DC motor suddenly loses contact between its brushes and the split ring
PHYSICS · Single correct · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current
Problem
A running DC motor suddenly loses contact between its brushes and the split ring. Which immediate effect is most likely observed?
(a) The coil rotates faster because the brush friction is removed.
(b) Heavy sparking occurs at the brushes due to intermittent contact.
(c) The coil stops rotating because no current reaches it.
(d) The current in the external circuit reverses direction.