Physics · Oct / Nov 2021 · Paper 11 · Question 28

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?

1. A1 only
2. B1 and 2 only
3. C2 and 3 only
4. D1, 2 and 3

As printed in the paper