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A straight right-circular cylindrical solenoid of radius R and length L> R is wound
wvith n turns of wire per unit length. The current / in the windings is rising slowly.
(a) Calculate the electric field (magnitude and direction) at a distance r<R from
the axis inside the solenoid and well away from its end.
(b) Calculate the electric field (magnitude and direction) at a distance r from the
axis such that R<r<L and not too far from the midpoint.
(c) Briefly discuss how your results might be changed if the current rises very
rapidly.

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