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Physics for Secondary Schools
4. Do not store or keep magnets near Magnetic field of a magnet
strong magnetic or electric fields. A magnetic field exerts a force on a
5. Do not subject magnets to any form magnetic material placed in it. Physicists
of severe stress, such as vibrations use magnetic field patterns to describe
the action of magnetic forces from a
or mechanical impacts. These can distance. If a magnet is dipped in iron
FOR ONLINE READING ONLY
physically damage the magnet. filings, the filings tend to cling around its
Permanent magnets are hard but ends. Similarly, if the filings are sprinkled
brittle at the same time. on a paper over a bar magnet, they will
be pulled to the poles of the magnet.
ICT Corner The filings thus become magnetised
Use ICT tools to research, design, and aligned, revealing the magnets field
and present how magnetisation and pattern as shown in Figure 3.26.
demagnetisation processes work,
including their methods and real-life
applications.
Exercise 3.2
1. (a) Briefly explain the origin of
magnetism.
(b) State the basic law of magnetism.
2. (a) Explain the concept of
ferromagnetic and paramagnetic
materials. Figure 3.26: Iron fillings around a bar magnet
(b) Explain three materials which
are classified as ferromagnetic
and paramagnetic. A magnetic field is the region around
3. (a) Differentiate between a magnet in which magnetic force can
magnetisation and be experienced by magnetic materials.
demagnetisation.
(b) Describe three methods through It is therefore, the indication of the strength
which a magnetic material can and direction of the force a magnet exerts
be magnetised. on magnetic materials. If the magnetic
4. (a) Explain four ways in which field is stationary, it is referred to as a
magnets are used in daily life. magnetostatic field. At any given point,
(b) In which part of a fridge or a its magnitude and direction remain the
microwave oven are magnetic same.
strips installed? Why?
5. How can you store magnets for One application of a magnetic field is in
effective and durable use of their the banking industry. Banks use magnetic
magnetism? ink on cheques and cheque deposit
slips so that the cheques are sorted out
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Student’s Book Form Two
Physics Form 2 Final.indd 108 25/10/2025 10:26
