1. The problem statement, all variables and given/known data A spherical capacitor is made of two insulating spherical shells with different dielectric constants k1 and k2 situated between two spherical metallic shells and separated by a vacuum gap. Geometrical dimensions of the cross-section are as shown in figure 2. Calculate the capacitance of this system. 2. Relevant equations C= Q/V(subscript ab) (couldnt figure out the formatting for subscripts :( 3. The attempt at a solution I honestly have no idea on how to do this, so that is why i am not looking for help getting the answer, i would just like some help on where to start. Problems without numbers really throw me through a loop and i can usually get them when i get a little jump start. i believe that i should begin by calculating the area of the insulating spheres with constants k1 and k2 and plug into the equation? or should i treat it as 1 spherical capacitor inside another? this gets 2 equations 4[tex]\pi\xi[/tex](r(sub b)r(sub a))/(r(sub b) - r(sub a)) and 4[tex]\pi\xi[/tex](r(sub d)r(sub c))/(r(sub d) - r(sub c)) and treat that as 1 big capacitor? in this way i get 4[tex]\pi\xi[/tex](r(sub d)r(sub b))/(r(sub d) - r(sub b))...does this sound right or am i off in the wrong direction?