1. The problem statement, all variables and given/known data Two point charges are placed on a horizontal line, the first is +3.0-μC located at x = 0.0-m, y = 0.0-m and the second is -4.0-μC located at x = 2.0-m, y = 0.0-m. At what points on the horizontal line y = 0.0 will the electric potential be zero? 2. Relevant equations V(r)=kq/r 3. The attempt at a solution V(total)=kq1/r1+kq2/r2=0 k(q1/r1+q2/r2)=0 k(3e-6/x-4e-6/(2-x)=0 x=6/7 So there should be no electric potential at x=6/7metres. Is that the only point?