A capacitor is formed from two concentric spherical conducting shells separated by vacuum. The inner sphere has radius 10.5cm , and the outer sphere has radius 15.5cm . A potential difference of 110V is applied to the capacitor. What is the energy density at r= 10.6cm , just outside the inner sphere? What is the energy density at r = 15.4cm , just inside the outer sphere? u = 1/2eoE^2 & E=V/d Basically i found E-field between the shells by using E=V/d where d was the difference in radii. Then subbed that into the Energy density one. Wrong I also tried to add radii then divide by 2 and use the given 10.6 cm value. Wrong and Wrong.