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nadeem0322

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## Homework Statement

There are two parallel plates. The plate on the left has an electric potential of +60 Volts. The right plate has an electric potential of 0 Volts. The plates are 8.0mm apart. Between the two plates lies a point P 2.0mm from the left plate with a charge -3.5pC. Point R lies a mass right in the middle. Point S lies 2.0mm from the right plate.

A)

i) What is the electric potential at point R?

ii) What is the electric potential at point S?

Point R lies a mass of 4*10^-19 kg with a charge -2pC.

B) What is the speed of the mass at R when it reaches point S if it has an initial velocity of 3.0*10^4 m/s.

## Homework Equations

V= kq/r

u=kqq/r

## The Attempt at a Solution

I solved this problem for Ai) using kq/r where r is the distance from R and P and q is charge at P. I then added the voltage of 60 volts to that number to get the total potential. I believe this is where I went wrong but I don't see how the 60 voltage plate could not affect the potential at the point. Any help would be great. Thanks