Question

The drawing shows four point charges. The value of q is 1.4 μC, and the distance d is 0.86 m. Find the total potential at the location P. Assume that the potential of a point charge is zero at infinity

Answer 1

Potential is a scalar, so direction of d is immaterial. From your description, I don't know the distances for the charges from point P. I will call them d1, d2, d3, d4

Voltage=kq /d1^2+kq/d2^2 + kq/d3^2 + kq/d4^2