(of
charge q) in motion (velocity
v), used as the definition of the
E field and
B field. Here subscripts
e and
m are used to differ between electric and
magnetic charges. The definitions for monopoles are of theoretical interest, although real magnetic dipoles can be described using pole strengths. There are two possible units for monopole strength, Wb (Weber) and A m (Ampere metre). Dimensional analysis shows that magnetic charges relate by
qm(Wb) =
μ0
qm(Am).
Initial quantities Electric quantities n̂,
d is the
dipole moment between two point charges, the volume density of these is the
polarization density P.
Position vector r is a point to calculate the electric field;
r′ is a point in the charged object. Contrary to the strong analogy between (classical)
gravitation and
electrostatics, there are no "centre of charge" or "centre of electrostatic attraction" analogues.
Electric transport Electric fields Magnetic quantities Magnetic transport Magnetic fields Electric circuits DC circuits, general definitions AC circuits Magnetic circuits ==Electromagnetism==