Two Charges Q₁ (= +6 C)and Q₂ (= -2

Multiple Choice

Two charges Q₁ (= +6 C) and Q₂ (= -2 C) are brought from infinity to positions on the x-axis of x = -4 cm and x = +4 cm,respectively.Is it possible to bring a third charge Q₃ (= +3 C) from infinity to a point on the x-axis between the charges where the potential is zero,and if so,where would this position be?

A) it is not possible
B) x = 0 cm
C) x = +2 cm
D) x = +6 cm
E) x = +1.5 cm