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Simple phenomena of magnetism

Simple phenomena of magnetism

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Question 3

A student suggests three methods for altering the magnetic state of a steel bar:

  1. Heating the steel bar until it is red hot while it is aligned in an east-west direction, then letting it cool.
  2. Placing the steel bar inside a coil carrying an alternating current (a.c.), then slowly withdrawing the bar.
  3. Hammering the steel bar repeatedly while it is held in a north-south direction.

Which of these methods will successfully demagnetise the steel bar?

A

1 only

B

1 and 2 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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