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Simple phenomena of magnetism

Simple phenomena of magnetism

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Question 19

A student wants to demagnetise a strong steel bar magnet. They consider the following three methods:

I. Place the magnet inside a long solenoid connected to an alternating current (a.c.) supply, then slowly withdraw the magnet along the axis of the solenoid. II. Place the magnet inside a long solenoid connected to a direct current (d.c.) supply, then slowly reduce the current in the solenoid to zero. III. Heat the magnet strongly until it is red hot, and then allow it to cool while it is oriented in an East-West direction.

Which of these methods will successfully demagnetise the bar magnet?

A

I and II only

B

I and III only

C

II and III only

D

I, II, and III

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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