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2- Consider a right-circular solenoid of finite
length L and radius a. Suppose that the sym-
metry axis of the solenoid is the z-axis, and that
it has N turns per unit length and carries a cur-
rent I. Show that when the product NL → 0,
the magnetic field B on the symmetry axis is
02
given by
HỌNI
(cos 01 + cos 02),
where the angles are as indicated in the figure.

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