Relationship Between B And H 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.

Relationship between b and h field.

Thus b is related to the properties of the material and its relation to the applied excitation e g. 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 fields h and b as in the electric case we have two flelds in the mag netic case. Another commonly used form for the relationship between b and h is.

The magnetization defines the auxiliary magnetic field h as gaussian units which is convenient for various calculations. The names and units of the six electromagnetic flelds. In dc fields static electric e fields create currents magnetization currents i when σ 0 which in turn produce static h fields. Where χ is called the volume magnetic susceptibility and.

Starting with an unmagnetised core both b and h will be at zero point 0 on the magnetisation curve. A relation between m and h exists in many materials. 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. Even if we used natural units where μ.

To further distinguish b from h b is sometimes called the magnetic flux density or the magnetic induction. The quantity m in these relationships is called the magnetization of the material. 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.

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. A static b field actually d dt b n da 0 cannot produce an electric field e. There are two different but closely related fields which are both sometimes called the magnetic field written b and h. Based on maxwell s equations electric fields are generated by changing b fields while h fields are generated by changing electric fields.

Begingroup h is a bit like the number of magnetic field lines and b kinda is how tightly packed they are. B μ 0 h m h and m will have the same units amperes meter. Bio savart law gives us b which i suppose is magnetic field. Historically the term magnetic field was reserved for h while.

The quantity h plays the role of d for the table i. 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 vacuum permeability μ 0 is by definition 4π 10 7 v s a m. Electric current can be highly non linear.