Page 484 - Basic Electrical Engineering
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c) Field strength inside a solenoid carrying current
Fig. 5.10 (a) shows a solenoid with N number of turns and having a length l.
The cross-sectional view has been shown in Fig. 5.10 (b).
Figure 5.10
We had calculated the field intensity at the centre of a circular coil as
To find the field strength at the centre of the solenoid, a section of the coil
of length dx is considered. The field strength due to it is
Thus,
