### By what factor does the stored energy change

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A capacitor consists of two concentric conducting spherical shells with radii R1 and R2 = 4.0R1. It has capacitance C = 4.0 pF, and is charged to a potential difference of 60.0 V. What is the energy stored in the capacitor? What is the charge on the capacitor when the electrical energy stored is 12.1 × 10?8 J? If the radius of the outer sphere is increased by a factor of 4.0 while the charge on the plates is kept constant, by what factor does the stored energy change?

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