**Electric Field and Potential in Two Dimensions**
http://physics.bu.edu/~duffy/Ejs/EP_chapter17/EField_and_Potential_2D_v2_Intro%201.html

the electric potential (V) produced by a point charge with a charge of magnitude Q, at a point a distance r away from the point charge, is given by the equation: V = kQ/r, where k is a constant with a value of 8.99 x 10 9 N m 2 /. electric potential is a scalar, so when there are multiple point charges present, the net electric potential at any ...

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