A coaxial capacitor consists of two concentric, conducting, cylindrical surfaces, one of r...

A coaxial capacitor consists of two concentric, conducting, cylindrical surfaces, one of radius a and another of radius b. as shown in Fig. The insulating layer separating the two conducting surfaces is divided equally into two semi-cylindrical sections, one filled with dielectric ε1 and the other filled with dielectric ε2.

(a) Develop an expression for C in terms of the length l and the given quantities.

(b) Evaluate the value of C