Suppose you have a line of length l that is charged. We will assume that there is a constant charge distribution, λ = a. What is the electric potential at a point P located a distance r away from the charged line?

a) a2πε0ln(rr0)
b) a4πε0ln(rr0)
c) a2πε0ln(r0r)
d) a4πε0ln(r0r)