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CAIE IGCSE Physics 4.5.5.1 A current-carrying coil in a magnetic

Practise judging how a current-carrying coil turns in a magnetic field and how motor changes affect the size of the turning effect.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • state that a current-carrying coil in a magnetic field experiences a turning effect
  • compare turning effect when current, field strength or number of coil turns changes
  • explain why the moment becomes zero when the coil reaches the vertical position

4.5.5.1—A current-carrying coil in a magnetic question 1

[Maximum number: 2]

Fig. 9.1 shows a simple direct current (d.c.) electric motor. The coil rotates about the axis when there is a current in the coil. The coil is connected to the rest of the circuit by the brushes.

Fig. 9.1

Fig. 9.1

Question (a)

(a)

State any difference each of the following changes makes to the rotation of the coil in Fig. 9.1:

[ 2 ]

Question (i)

(i)

changing the coil to the new coil shown in Fig. 9.3

Fig. 9.3

Fig. 9.3

[ 1 ]

Question (ii)

(ii)

using a stronger magnetic field.
[Total: 8]

[ 1 ]
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