The document explains magnetic intensity and intensity of magnetisation, defining magnetic intensity as the force experienced by a unit pole in an external magnetic field. It describes induced magnetisation as the magnetization of a non-magnetic material when subjected to an external magnetic field or current, a process known as electromagnetism. The conclusion emphasizes that external magnetic fields can magnetize non-magnetic materials through magnetic induction.

1. Magnetisation and Magnetic
intensity

2. Magnetic intensity
The magnetic intensity at any point is defined as the force
experienced by a unit pole when subjected to an external
magnetic field.

3. Intensity of magnetisation
• Intensity of magnetisation is defined as the magnetic moment
change per unit volume or pole strength per unit area
Mathematically,
I=M/V
since M= mX2l and V= Ax2l
= m/A
The unit of intensity of magnetisation is given by ampere/metre

4. Induced magnetisation
• Induced magnetisation is the process by which a non magnetic
material can be magnetized. For example, when a wire is wrapped
around a iron nail and connected to a battery, due to the flow of
current in the solenoid the iron nail, behaves as a magnet. This
process is also known as electromagnetism, which means induction
of magnetic fields by the presence of current.

5. Conclusion
• When a non magnetic material is subjected to an external
magnetic field it gets magnetized. This process is known as
magnetic induction. When the induction is done through
current, then it is known as electromagnetism. The induced
magnetic field has different force at different points.

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