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Simple phenomena of magnetism

Simple phenomena of magnetism

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Question 14

A student wants to demagnetise a strong permanent steel magnet. They suggest three possible methods:

  1. Heating the magnet to a high temperature and letting it cool while oriented in an east-west direction.
  2. Placing the magnet inside a solenoid connected to a stable direct current (d.c.\text{d.c.}d.c.) supply.
  3. Placing the magnet inside a solenoid connected to an alternating current (a.c.\text{a.c.}a.c.) supply and slowly withdrawing it.

Which of these methods will successfully demagnetise the steel magnet?

A

1 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

Markscheme

Simple phenomena of magnetism Questions

  1. IGCSE
  2. /Physics
  3. /Simple phenomena of magnetism

169 exam-style questions on CIE IGCSE Physics Simple phenomena of magnetism, covering Simple phenomena of magnetism. Each one has a worked solution and a mark scheme showing where the marks go.

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