Two long conducting cylindrical shells are coaxial and have radii of 20 mm and 80 mm. the electric potential of the inner conductor, with respect to the outer conductor, is +600 v. what is the maximum ,k electric field magnitude between the cylinders? = 1/4t 0 = 8.99 10 n m2/c2) answer r 18,000 v/m 14,000 v/m 10,000 v/m r 26,000 v/m 22,000 v/m