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From the relation between '''P''', the [[electric displacement]] '''D''', and the electric field '''E''' follows

...ations]] that contain charges and currents, are equations for '''H''' and electric displacement '''D'''. This is a consequence of the fact that current densities '''J''' a

...t is convenient to replace those two vectors by two auxiliary vectors, the electric displacement '''D''' and the magnetic field '''H'''.<ref>It is somewhat unfortunate that ...re seldom treated microscopically. Instead, in SI units, one defines the ''electric displacement'' '''D''' and the ''magnetic field'' '''H'''

...ating magnetic flux density '''''B''''' to magnetic field '''''H''''' and electric displacement '''''D''''' to electric field '''''E'''''.