Fundamentals of Engineering Electromagnetics 1st Edition by David Cheng

Exercise 38

Refer to Fig. 5-26; Determine the magnetic flux density at a point P on the axis of a solenoid with radius b and length L, and with a current I in its N turns of closely wound coil. Show that the result reduces to that given in Eq (5-82) when L approaches infinity. Hint: Use Eq. (5-37).