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O-LevelPhysicsMagnetism5054/12 · May/June 2017 · Q311 Mark

Which action demagnetises a bar magnet?

Aplacing the magnet inside a coil connected to a d.c. supply

Bplacing the magnet inside a coil connected to an a.c. supply

Cwithdrawing the magnet from inside a coil connected to a d.c. supply

Dwithdrawing the magnet from inside a coil connected to an a.c. supply

✓ Correct answer

D: withdrawing the magnet from inside a coil connected to an a.c. supply

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About this question

Topic: Magnetism, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2017 Paper 1 Variant 2, question 31.

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