O-LevelPhysicsMagnetism5054/11 · Oct/Nov 2021 · Q281 Mark
A teacher wants to demagnetise a bar magnet and tries three different methods. 1 Heat the bar magnet to a high temperature and let it cool. 2 Place the bar magnet east to west and hammer it. 3 Place the bar magnet inside a coil that has a direct current in it and remove it from the coil slowly. Which methods demagnetise the bar magnet?
A1 only
B1 and 2 only
C2 and 3 only
D1, 2 and 3
✓ Correct answer
B: 1 and 2 only
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