Page 107 - Physics_Form_2

Magnetism

8. Moving coil meters. attracted by the magnet? What are their
A horseshoe magnet is characteristics?
used in voltmeters and
ammeters. It is an inbuilt (c) Which of the objects could not be attracted
part of these devices that by the magnet? Why?
enables the pointers to 2. A magnet is cut into two equal pieces. What
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move in a direction of happens to the magnetic poles of each piece, and
increasing voltage or why?
current. 3. A student argues that all metals are magnetic.
Do you agree or disagree? Explain your answer

Task 3.1 with examples.
4. You are asked to design a simple tool for separating

In groups, search the magnetic materials from a pile of mixed waste
internet or other sources, at a recycling centre. The pile contains nails,
then describe other plastic wrappers, glass pieces, iron rods, and
applications of magnets. paper. Describe the tool you would design and
Write a report on your the method by which it operates.
findings and present your
work to the class.
Magnetisation and demagnetisation
Exercise 3.1 Magnets are manufactured by aligning the tiny atomic

1. In a certain primary magnets of a material. The process of making a magnet
school, a teacher is called magnetisation. Likewise, demagnetisation is
demonstrated how the process of destroying or removing the magnetism
magnets work by giving in a magnetised material.
students different objects
like a nail, plastic ruler, Magnetisation
coin, wooden pencil, The atoms of most materials act like tiny magnets
and paperclip, along called atomic dipoles. If the material is not yet
with a bar magnet. The magnetised, its atomic dipoles randomly align,
students were asked to forming magnetic domains as shown in Figure 3.16.
identify objects that were
attracted to the magnet Magnetic
and those which are not. domain
(a) Why could some
objects be attracted Individual
atomic
to the magnet and dipole
others not?
(b) Which of the
objects could be Figure 3.16: Random alignment of atomic dipoles in
unmagnetised material

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Physics Form 2 Final.indd 101 25/10/2025 10:26