A funny capacitor.

[Ludwik Kowalski <KowalskiL@MAIL.MONTCLAIR.EDU>]

Let me present a Hewitt-like question.

Consider a parallel plates capacitor as at A below.

                A

          *           *
          *           *
    *******           *******            C1
          *           *
          *           *

The floor, the ceiling and the walls are very far
away. The capacitance is C1. Then bring a third
plate and position it as in B below.

                B

          *           *
          *           *
    *******           *******            C2
          *           *
          *           *

            *********

Will the new capacitance, C2, be larger, smaller
or the same as C1? In my opinion it will be smaller.
Do you agree? Please justify the answer.
Ludwik Kowalski