Question: 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

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

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

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