Page 521 - Basic Electrical Engineering

the value of the exciting current through the coil. The relative permeability of
the flux path is 1000.

Solution:

A weight of 200 kg has to be lifted by both the poles of the electromagnet.
Thus, each pole will have to lift a load of 100 kg. The force of attraction

which is also called the lifting power of the electromagnet is

Putting the values,

F = 100 kg = 100 ×9.8 N
Again

or,

We know

H × l = AT = NI

or,