In the magnetic pole model , the elementary magnetic dipole m is formed by two opposite magnetic poles of pole strength qm separated by a very small distance vector d , such that m = qm d . Since it is based on the fictitious idea of a `` magnetic charge density '' , the Gilbert model has limitations .
In the magnetic pole model , the elementary magnetic dipole m is formed by two opposite magnetic poles of pole strength qm separated by a very small distance d , such that m = qm d. Unfortunately , magnetic poles can not exist apart from each other .