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🔬 Science - Class 8
Unit 8 · Electricity and Magnetism

Demagnetisation Presentation

ScienceSubject
8 minEstimated read
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Science and Technology, Class 8

Demagnetisation

The order of molecular magnets · Four causes of loss · Ways to protect

What We Learn Today

🧲

Say what demagnetisation means

🔬

Explain magnetism through the order of molecular magnets

🔥

Name the four causes that destroy a magnet's power

📦

Use the ways of protecting a magnet

The Order Inside Is the Magnetism

🔀Scattered order
Molecular magnets face every direction
They settle in small closed groups
Their pulls cancel each other
No magnetism shows outside
VS
➡️Ordered
All molecular magnets lie parallel
All north poles face one way
Their pulls add together
One end is N and the other is S

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Presenter notes: Show the class an old weak magnet and a new one. Count the pins each can lift, and start from that difference.