Convince yourself that parts (a) ,(b) and (c ) of figure are identical . Find the capaciance between the point A and B of the assembly .

Explanation

As the bridge in the balanced form there is no current through `5 mu F` capacitor
So, `C = 2.25 mu F`
Similarly increase of (b) = d ( c)
As 'b' can also be written as
` C_eq = 2.25 mu F` .