A Square Is 1

Multiple Choice

A square is 1.0 m on a side.Point charges of +4.0 μC are placed in two diagonally opposite corners.In the other two corners are placed charges of +3.0 μC and -3.0 μC.What is the potential (relative to infinity) at the midpoint of the square? (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

A) 1.0 × 10⁴ V
B) 1.0 × 10⁵ V
C) 1.0 × 10⁶ V
D) 0 V
E) infinite