2) A coaxial capacitor consists of two concentric, conducting, cylindrical surfaces, one of radius a and another of radius b, as shown below. The insulating layer separating the two conducting surfaces is divided equally into two semi-cylindrical sections, one filled with dielectric Є1 and the other filled with dielectric €2. Develop an expression for C in terms of the length 1 and the given quantities. Assume the electric field is in radial direction and also uniform in the azimuth direction in each region. Do not use circuits theory. 82 a tb I ε1