Relationship Between B And H Field

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.

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. 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. 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.

A relation between m and h exists in many materials. 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. Starting with an unmagnetised core both b and h will be at zero point 0 on the magnetisation curve. E d p b h and m.

B μ m h. Historically the term magnetic field was reserved for h while. The quantity h plays the role of d for the table i. In diamagnets and paramagnets the relation is usually linear.

A static b field actually d dt b n da 0 cannot produce an electric field e. Bio savart law gives us b which i suppose is magnetic field. 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.

Even if we used natural units where μ. Begingroup h is a bit like the number of magnetic field lines and b kinda is how tightly packed they are. 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. The names and units of the six electromagnetic flelds.

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. Based on maxwell s equations electric fields are generated by changing b fields while h fields are generated by changing electric fields. The magnetic hysteresis loop above shows the behaviour of a ferromagnetic core graphically as the relationship between b and h is non linear. Where χ is called the volume magnetic susceptibility and.

B μ 0 h m h and m will have the same units amperes meter. The magnetization defines the auxiliary magnetic field h as gaussian units which is convenient for various calculations. Electric current can be highly non linear. The vacuum permeability μ 0 is by definition 4π 10 7 v s a m.