A long coaxial cable consists of an inner cylindrical conductor with radius a an

Question

A long coaxial cable consists of an inner cylindrical conductor with radius a and an outer coaxial cylinder with inner radius b and outer radius c. The outer cylinder is mounted on insulating supports and has no net charge. The inner cylinder has a uniform positive charge per unit length ?.

Part B

Find the direction of the electric field at any point between the cylinders a distance r from the axis.

Find the direction of the electric field at any point between the cylinders a distance  from the axis.

Explanation / Answer

E=?/(2??r) if a?r?b and r?c
E=0 if r<a and b<r<c

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