1

I am really confused between magnetic field (B)and magnetic field intensity(H) and magnetisation intensity(I) Please can someone explain them to me and these formula H=B/μ -I, I=M/V, I am a high school student so i may not be able to understand tensors and stuff which a lot of other articles i read used. I also don't yet know the analogies of these with there electrostatic counter parts.

Qmechanic
  • 220,844
Abhinav Gupta
  • 15
  • 1
  • 7

1 Answers1

1

The magnetization (intensity) is defined as the magnetic dipoles $\mathbf{\mu}$ per unit of volume:

$$ \mathbf{M} = \frac{\sum \mathbf{\mu}_i}{\Delta V} \hspace{10pt} [Am^{-1}]$$

The magnetization is material related. Some materials have magnetic dipoles and thus magnetization whereas others have not.

The magnetic field is $\mathbf{H}$ with units $[Am^{-1}]$. The field can be nonzero in a material but also be nonzero in vacuum (whereas the magnetization is zero in vacuum because there are no dipoles). This magnetic field is also the field present in an electromagnetic wave for example.

The magnetic induction is defined as the sum of the magnetic field and magnetization:

$$\mathbf{B} = \mu_0 (\mathbf{H} +\mathbf{M})\hspace{10pt} [T]$$

So, the magnetic induction can be seen as a quantity that quantifies the net magnetic strength at a specific point in space. It takes into account the magnetic effects originating from fields ($\mathbf{H}$) and from the materials themselves ($\mathbf{M}$).

Frederic
  • 1,149