CapacitanceEasy

Question

Two identical capacitors, have the same capacitance C. One of them is charged to potential V1 and the other to V2. Likely charged plates are then connected. Then, the decrease in energy of the combined system is

Options

A. C(V12 - V22)
B. C(V12 + V22)
C. C(V12 - V2)2
D. C(V12 + V2)2

Solution

ᐃ U = decrease in potential energy
= Ui - Uf
= C(V12 + V22) - (2C) = C(V1 - V2)2

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