This document discusses making and testing magnets. It describes how to make a new magnet by using a strong magnet to magnetize a piece of iron or steel by stroking it in one direction multiple times. It also explains how to test the strength of a magnet by assessing how much mass it can lift and how far away it can attract objects, with stronger magnets affecting larger objects from greater distances. Additionally, it notes that horseshoe magnets, with their U-shape bringing the poles closer together, are much stronger than bar magnets.

1. 9.7 Making and
Twsting 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

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