Four identical plates
1,2,3, and
4 are placed parallel to each other at equal distance as shown in the figure. Plates
1 and
4 are joined together and the space between
2 and
3 is filled with a dielectric of dielectric constant
k=2. The capacitance of the system between
1 and
3 &
2 and
4 are
C1 and
C2 respectively. The ratio
C1/C2 is :