CAIE IGCSE Physics 4.5.5.2 Operation of an Electric Motor Questions

Learn how a split-ring commutator reverses coil current every half-turn to maintain motor rotation.

Exam points

explain how a current-carrying coil experiences turning forces in a d.c. motor
state the functions of brushes and the split-ring commutator
explain how current reversal every half-turn keeps the motor rotating continuously

[Maximum number: 5]

Fig. 8.1 shows a horizontal, flat coil in a magnetic field

Fig. 8.1

The coil is connected to a cell. The coil rotates.

(a)

State and explain what happens to the coil as it reaches the vertical position.

[ 2 ]

(b)

To operate as a motor, a split-ring commutator and brushes are added to the parts shown in Fig. 8.1.

Explain the effects of the split-ring commutator and the brushes on the action of the motor.

[ 3 ]

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CAIE IGCSE Physics 4.5.5.2 Operation of an Electric Motor Questions question 1

Question (a)

Question (b)