Passage X
Electromagnets are used in a variety of industrial processes and often consist of a large solenoid, a helical coil of wire, that produces a
uniform magnetic field strength when a current passes through it (see Figure 1).
Figure 1The magnetic field of a solenoid is a factor of its resistance to changes in current, a property called inductance (L). The relative
permeability, μ, is a property of the material within the solenoid coils which may magnify the magnetic field strength.