magnetic flux

relative object fields time spin externally decreases component magnet experiences intrinsic loops dipole effect proportional lorentz device bipolar laboratory attraction repulsion henry background symbol fluctuating rotating magnetically generator boundary solenoid pulsed ferromagnetic volume electromotive permanent magnitude henries magnetic field technical primary insulation power inductor circuit wrap electronic winding ac technology charge science electromagnetic wire coil vector copper physics wound current education demonstration electrical electric energy force solenoid induce voltage conductor engineering electricity direction magnetic flux induction lab electromagnetism inductance iron