Given, C1=C2=C When both capacitors are connected in series, their equivalent capacitance will be
1
Cs
=
1
C
+
1
C
=
2
C
Cs=
C
2
⇒Cs=
C
2
When both capacitors are connected in parallel, their equivalent capacitance will be Cp=C+C=2C ∴ The ratio of equivalent capacitance in series and parallel combination is