A right-circular solenoid of finite length L and radius a has N turns per unit length and
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A right-circular solenoid of finite length L and radius a has N turns per unit length and carries a current I. Show that the magnetic induction on the cylinder axis in the limit NL?? is
Bz = ?0NI/2 (cos ?1 + cos ?2)
Where the angles are defined in the figure
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