magnetic flux

…found that (1) a changing magnetic field in a circuit induces an electromotive force in the circuit; and (2) the magnitude of the electromotive force equals the rate at which the flux of the magnetic field through the circuit changes. The flux is a measure of how much field penetrates…

This current interacts with the magnetic flux to produce a counterclockwise torque, which in turn accelerates the rotor. When the rotor has turned about 120°, the connection from the supply to the armature coil is reversed by the commutator. The new direction of the current in the armature coil is…

…in contrivances in which the magnetic flux is to be varied, reversed, or switched on and off.

…can be used to generate magnetic flux that increases over time. The time-varying flux induces a toroidal electric field that drives the plasma current. This technique efficiently drives a pulsed plasma current. However, it cannot be used for a steady-state current, which would require a magnetic flux increasing indefinitely over…

…space linked to Io by magnetic field lines (a flux tube) that move with Io. Electrons moving in spirals around the magnetic field lines could produce the observed radiation. Interactions between these electrons and the Jovian ionosphere are expected and indeed were observed by the Voyager and Galileo spacecraft. The…

…field, represented as lines of magnetic flux, is confined. In contrast to an electric circuit through which electric charge flows, nothing actually flows in a magnetic circuit.

…continuous lines of force or magnetic flux that emerge from north-seeking magnetic poles and enter south-seeking magnetic poles. The density of the lines indicates the magnitude of the magnetic field. At the poles of a magnet, for example, where the magnetic field is strong, the field lines are crowded together,…

…as shown in the diagram, magnetic field lines leave the north pole of the magnet and curve around until they cross Earth’s Equator pointing geographically northward. They curve still more reentering Earth in northern latitudes, finally returning to the south pole of the magnet. At the present time, the north…

Within the magnetosphere each magnetic field line has a characteristic frequency of oscillation determined by its length, the strength of the field along it, and the mass of the particles attached to it. If the waves entering the magnetosphere have the same frequency as the field line, they force…

…model of substorms, transport of magnetic flux and particles never reaches equilibrium. During the growth phase of a substorm, magnetic flux is eroded from the dayside and added to the lobes of the magnetotail. The dayside magnetopause moves inward as a result of the flux lost, while the polar caps…