A magnetic field is made up of flux lines.
Hysteresis is the number of lines of force per unit area in a magnetic field.
A relay is an electromagnetically controlled mechanical device in which electrical contacts are opened or closed by a magnetizing current.
Reluctance in a magnetic circuit is analogous to current in an electrical circuit.
If a conductor is moved back and forth at a constant rate in a constant magnetic field, the voltage in the conductor will reverse polarity.
Materials with a low retentivity do not retain a magnetic field very well.
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