THICKNESS OF PLATE VARIATION WILL AFFECT THE CAPACITANCE OF CAPACITOR OR NOT?
Answers
Normally the answer is no for a parallel plate capacitor. See that the capacitance equation for a parallel plate capacitor does not include plate thickness, but only Surface Area (A), Electric Permittivity of the Dielectric (ϵϵ), and separation distance (d):
C=ϵAdC=ϵAd
However, in the real world there will be fringe effects of the electric field lines near the edges of the plates which will depend slightly on the thickness of the plates. The fringe effects will have a lesser magnitude if the relative permittivity of the dielectric is much stronger compared to surrounding medium, e.g., air. Sidebar, a similar fringe effect at the edge can occur in microstrip transmission lines on printed circuit boards. However, the effect of the plate thickness is rather limited since most of the charge (electrons and electron holes) will be at the surface each parallel plate trying to get to the other side. So by and large, the thickness of the plates can be ignored for most applications.