Electric vehicles use a direct current (d.c.) electric motor powered by a battery for
propulsion. A simplified diagram of a d.c. electric motor is shown.
A split ring consists of two semi‑circular sections that are attached to a coil. The coil is
labelled ABCD. Two brushes, made of carbon, rub against and make electrical contact
with the split ring.
coil
axis
C B
magnet
N S
D A
split ring brush
*(a) Describe how this arrangement can lead to the coil rotating.
(6)
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