A solenoid has n turns per unit length and radius R and carries a current I. Its axis is along the x axis with one end at x = ??? and the other end at x = +?? where ? is the total length of the solenoid. Show that the magnetic field B at a point on the axis outside the solenoid is given by

Where

And

Transcribed Image Text:

B =Honl(cos 0,- cos 0,) 29-35