This document discusses making and testing magnets. It describes how magnets can be made by using another magnet to magnetize a piece of iron or steel by stroking it in one direction many times. It also explains how the strength of a magnet can be tested by observing how much mass it can lift and how far away it can attract other objects. Stronger magnets can lift heavier objects and work from a greater distance. Horseshoe magnets, which bring the poles closer together, are much stronger than bar magnets of the same size.

1. 9.7 Making and
Testing magnets
MUHAMMAD ABDUL MAGEID
Physics – VIII Cambridge

2. After this topic you should be able to:
 Use one magnet to produce another
 Test the strength of a permanent magnet.
Key terms :
Magnetised
Learning Outcomes

3. 01 Magnetite
A form of iron oxide
04 Horseshoe (U-shaped) magnet
Much stronger than bar magnet
02 Making magnets
Magnetised
Points of our topic
03 Testing magnets
Magnetic force

4. 01
Magnetite
 A form of iron oxide which is natuarally
occuring magnetic mineral found in Earth’s
crust
 Small pieces of magnetite were used
thousands of years ago to form the first
compasses
 These pieces of magnetite were called
lodestones
 Lodestones are not very strong magnets

5. 02 Making magnets

6. Making magnets
 Magnets can be made using other other
magnets or by using large electric currents.
 The simplest way to produce a new magnet
is to move a strong magnet along a piece of
iron or steel in one direction as shown in the
diagram
 After many stokes the new piece of metal
becomes magnetised

7. Practical Activity : Making Magnets

8. Testing Magnets
03

9. The stronger a
magnet is the
greater the
magnetic force

10. The stronger magnets can lift
larger objects and affect them
from a greater distance

11. Practical Activity : Testing the strength of a magnet

12. Practical Activity : Testing the strength of a magnet

13. 04
Horseshoe Magnets
Magnets can be shaped into U or horseshoe
shapes to bring the poles closer together
this makes the magnet much stronger

14. CREDITS: This presentation template was created by Slidesgo,
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