What is magnetising field | magnetism and matter class 12

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What is magnetising field?

When a magnetic material is placed in a magnetic field, a magnetism is induced in it. Thus the magnetising field can be defined as:

Magnetising field: The magnetic field that exists in vaccum and induces magnetism in any magnetic material is called magnetising field.

Magnetising field explanation

What is magnetising field | magnetism and matter class 12
Fig. 1, magnetising field in toroidal solenoid, source: hyperphysics

Lets consider a toroidal solenoid that carrying a current I and that’s placed in vaccum. If the solenoid has n turns per unit length, then the magnetic field setup in the solenoid is given by:

    \[B_0=\mu_0 nI\]

So the magnetic field that arise in the toroidal solenoid due to the free current called magnetising field.

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