AP Physics C: E&M
10.3 Capacitors
10.2 Redistribution of Charge between Conductors
An isolated, uncharged conducting sphere B of radius R is brought into contact with an identical conducting sphere A that initially carries a net charge Q_0. The two spheres reach electrostatic equilibrium and are then separated. What is the ratio U_f / U_i of the total electrostatic potential energy stored in the two-sphere system after separation to the total electrostatic potential energy stored before contact?
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