Physics - Electrostatics Question with Solution | TestHub

Two conducting spherical shell of radii R & 2R given charges Q and 2Q respectively. Inner shell is provided with a switch which can ground the inner shell, as shown. Switch is initially open and energy stored in the system is ${\mathrm{U}}_1$. After the switch is closed, energy stored in the system is found to be ${\mathrm{U}}_2$. Find $\frac{{\mathrm{U}}_1}{{\mathrm{U}}_2}$.