Impulse selection is a scheme for operating ferrite cores which have low values of coercive force. Twodifferent threshold properties of a core are utilized. One threshold is the dc coercive force, which can bechanged electrically. The other threshold results from the inertial magnetic effects within the core whichare predominant when pulses of very narrow widths are applied. The switching behavior of ferrite coresis discussed when two threshold currents, a low amplitude current and an impulse of current, are combined.The application of this property to core logic is considered.