Relationship Between B And H Field

Historically the term magnetic field was reserved for h while.

Relationship between b and h field.

B μ m h. But i have read in many places h is magnetics field and is defined as and we have relation as b mu0 h where b is magnetic flux density. A static b field actually d dt b n da 0 cannot produce an electric field e. E d p b h and m.

In diamagnets and paramagnets the relation is usually linear. There are two different but closely related fields which are both sometimes called the magnetic field written b and h. Bio savart law gives us b which i suppose is magnetic field. More amps more turns shorter core means more field lines bigger h aturns m higher permeability measure of how easily those field lines can flow means they can be packed tighter together in the core larger b more intense magnetic field.

Starting with an unmagnetised core both b and h will be at zero point 0 on the magnetisation curve. Another commonly used form for the relationship between b and h is. The quantity m in these relationships is called the magnetization of the material. Symbol name units e electric field v m n c p polarization c m2 d electric displacement c m2 b magnetic induction n a m.

A relation between m and h exists in many materials. Even if we used natural units where μ. While both the best names for these fields and exact interpretation of what these fields represent has been the subject of long running debate there is wide agreement about how the underlying physics work. The quantity h plays the role of d for the table i.

The names and units of the six electromagnetic flelds. Begingroup h is a bit like the number of magnetic field lines and b kinda is how tightly packed they are. The vacuum permeability μ 0 is by definition 4π 10 7 v s a m. To further distinguish b from h b is sometimes called the magnetic flux density or the magnetic induction.

B μ 0 h m h and m will have the same units amperes meter. Thus b is related to the properties of the material and its relation to the applied excitation e g. If the medium is non continuous or anisotropic then magnetic poles or a demagnetising field could be created which themselves become sources of local excitation and they add to the source. The fields h and b as in the electric case we have two flelds in the mag netic case.

The magnetization defines the auxiliary magnetic field h as gaussian units which is convenient for various calculations. In dc fields static electric e fields create currents magnetization currents i when σ 0 which in turn produce static h fields. If the magnetisation current i is increased in a positive direction to some value the magnetic field strength h increases linearly with i and the flux. Where χ is called the volume magnetic susceptibility and.