1. The problem statement, all variables and given/known data Two capacitors connected in series store energy U. Now the two capacitors are connected in parallel to the same voltage source and have energy 5U. What is the ratio of the larger to small capacitor? 2. Relevant equations For series capacitors Ceq=C1C2/(C1+C2) For parallel capacitors Ceq=C1+C2 U=Q2/2C=V2C/2 3. The attempt at a solution I've tried everything that has come to mind: I've tried using the U ratio as the answer but that is not it I've tried solving for C1 and C2 but i could not find the info without knowing at least one equivalent capacitance. I've tried playing around with the symbols, setting things equal etc but i end up going in circles.