# Potential at a point on the plate of a parallel plate capacitor

In the two plates of a parallel plate capacitor, the charges are equal and opposite i.e $q$ and $-q$. Can I say the potentials of these plates as $V_1$ and $-V_1$, so the difference in potentials will be $-V_1$ $-V_2$= -2$V_1$? What could be a formulae for $V_1$? What exactly it means by potential at a point on the plate? If there are 1000 charges on the plate and we want to know the potential of a point where already a charge is there, so is it like if I did some amount of work $w$ in bringing this single charge $q$ from infinity to the point against the repulsive forces of 999 charges? If a unit charge it taken there how much work is to be done i.e $w/q$? If so, why we don't have a formulae for the potential at a point on the surface of a plate?

• In English, end each sentence with a period or a question mark. Capitalize "I". Also please use mathjax. – DanielSank Mar 18 '17 at 16:35
• -1. You are asking too many questions here. Please focus on one question. – sammy gerbil Mar 18 '17 at 17:57