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O-LevelPhysicsMagnetism5054/11 · May/June 2011 · Q341 Mark

The coil in an electric motor is wound onto a cylinder. Why is the cylinder made of soft iron?

Ato deflect the magnetic field away from the coil

Bto increase the current through the coil

Cto increase the strength of the magnetic field through the coil

Dto support the coil and prevent it from collapsing

✓ Correct answer

C: to increase the strength of the magnetic field through the coil

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About this question

Topic: Magnetism, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2011 Paper 1 Variant 1, question 34.

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