1. The problem statement, all variables and given/known data Hi, I would really appreciate clarification on the definition of capacitance in this context: Suppose I have 3 concentric metal spherical shells and they have charges Q1,Q2,Q3 and potentials 0,V,0 and radii a,b,c respectively, what is the capacitance of the configuration? 2. Relevant equations C=Q/V 3. The attempt at a solution I know what the capacitance is with only 2 spheres but I am not sure what it means with 3.