A positive charge q is fixed at the point x = 0, y = 0, and anegative charge -2q is fixed at the point x = a, y = 0.
a) Derive an expression for the potential V at pointson the x -axis as a function of the coordinate x. Take V to be zero at an infinite distance from thecharges. (Express your answer in terms of the given quantities andappropriate constants).
V(x) =
b) At which positions on the x -axis is V = 0?(Enter your answers numerically separated by commas).
x/a =
c) What does the answer to part A become whenx>>a ?
V =
d) Explain why this result is obtained.
