Consider a point located equidistant from point charges a and b, labeled c in the diagram. if a and b have the same magnitude charge and are both positive, which way does the electric field vector point at c? left down up right

Answer B Down

The direction of electric field is given by the direction of electrostatic force at that point on any positive test charge. The magnitude of both the charges are same and positive so the positive test charge at C is repelled by both the charges resultant force direction is downward as forces on left and right balance out.