Capacitor

A source of potential difference \(V\) is connected to the combination of two identical capacitors as shown in the figure. When key '\(K\)' is closed, the total energy stored across the combination is \(E_{1}\). Now key '\(K\)' is opened and dielectric of dielectric constant 5 is introduced between the plates of the capacitors. The total energy stored across the combination is now \(E_{2}\). The ratio \(E_{1} / E_{2}\) will be :