Page 503 - Basic Electrical Engineering

electromagnet can be used to do some mechanical work for us. For example,
electromagnets are used to lift iron ores from the place of storage and bring
them for processing when required.

Example 5.2 A circular iron ring of mean diameter 25 cm and cross-
2
sectional area 9 cm is wound with a coil of 100 turns and carries a current of
1.5 A. The relative permeability of iron is 2000. Calculate the amount of flux
produced in the ring.

Solution:

Mean length of flux path,

Flux,

Figure 5.21