Table of Contents
Table of Contents
- Magnetisation
- Demagnetisation
- Demagnetising a Magnet
- Demagnetising a Temporary Magnet
- Demagnetising a Permanent Magnet
- Summary
- What’s Next?
In the previous segment, we learned about different shapes of magnets. In this segment, we will learn about demagnetising a permanent magnet
What is Magnetisation?
Magnetisation is a process in which any non-magnetic material is magnetised. This process is carried out to convert a non-magnetic material into a temporary magnet or a permanent magnet.
What is Demagnetisation?
Demagnetisation is a process in which a temporary or a permanent magnet is demagnetised.
That is, it is a process in which ‘magnetism’ is taken away from the magnet.
How to demagnetise a magnet?
- Demagnetising a temporary magnet
When an iron nail is brought near one of the poles of a magnet, it gets attracted to it. This nail is now magnetised. It is because it is placed under the magnetic field of the magnet and hence it acquires magnetism from this magnet. If any other lightweight ferromagnetic material is brought near it, then this nail will attract that material.
As soon as this nail is taken away from the magnet, it loses its magnetism quickly. It will no longer attract any material. Now, this iron nail cannot act as a temporary magnet anymore! When the nail is removed from the external magnetic field of the magnet, it is actually demagnetised.
