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A spherical capacitor is formed from two concentric, spherical conducting shells separated by a vacuum.


A spherical capacitor is formed from two concentric, spherical conducting shells separated by a vacuum. The inner sphere has a radius of 15.0 cm and the capacitance of the device is 116 pF.  

a) What is the radius of the outer sphere?  

b) If the potential difference between the two spheres is 220 V, how much energy is stored in this capacitor?

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