JEE Main 8 Jan 2020 Shift 1 Solved Paper

Effective capacitance of parallel combination of two capacitors C1 and C2 is 10 µF. When these capacitors are individually connected to a voltage source of 1V, the energy stored in the capacitor C2 is 4 times that of C1. If these capacitors are connected in series, their effective capacitance will be :