Parallel plate capacitor
Parallel plate capacitor consists of two parallel metallic plates (may be circular, rectangular, square) separated by a small distance.
It is clear from above derivation that the capacitance of a parallel plate capacitor depends upon the area of plates, separation between the plates and dielectric medium filled between the plates or capacitance depends on – Geometry of conductors, Orientation of conductors and Medium.
Force of Interaction between the plates of a parallel plate capacitor
If dielectric is placed between plates Force remains same because electric field inside dielectric is charging but not in vacuum or air. Intersection of dielectric is also there to counter this force of attraction.