What is the physical signification of H (magnetic) and D ( electrical displacement)?
H is magnetic field intensity. It is usually thought of as the excitation or independent variable. The resulting flux density, B H * mu (permeability). B is the result of the applied H field. D is charge displacement in a dielectric material due to the presence of an applied electric field. D epsilon * E + P where P is the polarization vector and epsilon is the permitivity of the material.
