Along 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 . Calculate the electric field
a) at any point between the cylinders a distance r from the axis and
b) at any point outside the outer cylinder.
c) Graph the magnitude of the electric field as a function of the distance r from the axis of the cable, from r= 0 to r= 2c.
d) Find the charge per unit length on the inner surface and on the outer surface of the outer cylinder.