41) Now for uniform electric field, potential difference is simply the electric
field times the distance between the plates, that is,
0
1 Qd
V
E d
A
ε
=
=
(2 42)
The capacitance C of the parallel plate capacitor is then
Q
C
=V
 = 
=εd0A
(2 43)
which, as expected, depends only on the geometry of the system