The phenomenon whereby a force is brought to bear on a moving electron or hole by a magnetic field that is applied perpendicular to the direction of motion. The force direction is perpendicular to both the magnetic field and the particle motion directions.
This effect is exploited in such devices as the mass spectrometer and in the Thompson experiment. Also, the effect is important in determining the behaviour of the electrical currents generated by winds in the lower ionosphere.
See also: Hall Mobility.