1. The problem statement, all variables and given/known data The plates of a spherical capacitor have radii 51.8 mm and 55.0 mm. (a) Calculate the capacitance. (b) What must be the plate area of a parallel-plate capacitor with the same plate separation and capacitance? (givens) a = 51.8 mm b = 55.0 mm d = 3.2 mm ε0 = 8.85E-12 (unknown) Part a: Csphere = ? Part b: A (plate area of parallel-plate capacitor) = ? 2. Relevant equations (Spherical Capacitor) Csphere = 4πε0 * [(a*b)/(b-a)] (Parallel Capacitor) Cparallel = (ε0*A)/d Csphere = Cparallel 3. The attempt at a solution Csphere = 4π(8.85E-12[F/m]) * ((51.8[mm]*55.0[mm]*E-6)/((55.0[mm] - 51.8[mm])*E-3)) = 9.896E-11 F = 98.86 pF I could easily solve the second part just by plugging in this capacitance for the parallel-plate capacitor, but the program I am plugging the answer into tells me my answer is wrong. I have double checked the answer, even triple checked the answer, it seems to be coming down to some calculation error?