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Simple phenomena of magnetism

Simple phenomena of magnetism

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Question 2

A student wishes to demagnetise a strongly magnetised steel bar. Consider the following proposed methods:

  1. Heating the steel bar to a very high temperature and letting it cool while lying in an East-West direction.
  2. Placing the steel bar inside a solenoid carrying a large alternating current (a.c.) and then slowly withdrawing it along the axis of the solenoid.
  3. Placing the steel bar inside a solenoid carrying a large direct current (d.c.) and then slowly withdrawing it along the axis of the solenoid.
  4. Placing the steel bar in an East-West direction and hammering it repetitively.

Which of these proposed methods will successfully demagnetise the steel bar?

A

1, 2, and 3 only

B

1, 2, and 4 only

C

1, 3, and 4 only

D

2, 3, and 4 only

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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