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:
