[en] The effect of a ring current inductive electric field on the motion of electrons trapped in the magnetosphere is investigated. The lowering of mirror height of the electrons is of primary concern. The guiding center equations are used to describe the particle motion in a dipole field and an inductive electric field that is produced by a time-dependent symmetric ring current. The equations are solved numerically by means of a fourth-order Runge-Kutta technique. Results of the calculation show that a westward inductive electric field of about 0.6 mV/m can lower the mirror heights of electrons to the auroral height (approx.100 km) from 200 km in about 290 s. The increase in the collision frequency accompanying such a lowering is 3 orders of magnitude or greater, so that the loss of electrons to the atmosphere should be greatly enhanced