What is a magnetic field?
Magnetic field
An important use of H is in magnetic circuits where B = μ</i><b>H inside a linear material. Here, μ is the magnetic permeability of the material. This result is similar in form to Ohm's law J = σ</i><b>E, where J is the current density, σ is the conductance and E is the electric field. Extending this analogy, the counterpart to the macroscopic Ohm's law (I = V⁄R) is: