Answer to Question #176461 in Physics for Kanda Gideon

Question

Consider two 100microfarads capacitors.one charged to 10 V, disconnected from power supply and then connected across the other.calculate the energy stored by the combination

Answer 1

$$q=CU\\C'=2C\\ E=0.5\frac{q^2}{2C'}\\ E=0.5\frac{C^2U^2}{4C}\\ E=\frac{CU^2}{8}\\ E=\frac{(10^{-4})(10)^2}{8}=1.25\ mJ$$