Page 502 - Basic Electrical Engineering

Figure 5.20 Lifting power of an electromagnet

(A × l) is the volume of the air gap between the electromagnet and the iron

piece.

Force,

or,

The stored energy of the magnetic field between the electromagnet and the
piece of iron is able to pull the iron piece towards it. When the exciting coil

of the electromagnet is energized by passing current, the force of attraction
will pull the iron near to the face of the electromagnet. Such electromagnets

can be used to pull or lift large amount of magnetic material and shift the
material from one place to the other. Thus, the lifting power of the