A long metal cylinder with radius a is supported on an insulating stand on the axis of a long, hollow, metal tube with radius b. The positive charge per unit
length on the inner cylinder is λ and there is an equal negative charge per unit
length on the outer cylinder. (a)take V=0 at r=a Calculate the potential V(r) from (1) r b. (b)To calculate the electric field at any point between the cylinders, that is
a