# Dependence of the Capacitance on the Material and Geometry of the Plates

I have two questions concerning capacitors:

1) We know that the capacitance of a capacitor also depend on the dielectric material inside as

$C=$ $\dfrac{K \epsilon_0 A}{d}$

But what if the material itself with which the capacitor is made is changed? So is there different values for a capacitor made of iron and one made of copper? Will it follow the same formula?

2) What if we put another plate inside one capacitor either parallely or obliquely as

Initially:

Modified:

OR: