Two positive charges \(Q\) and \(4 Q\) are placed at points \(A\) and \(B\) respectively, where \(B\) is at a distance 'd' units to the right of A. The total electric potential due to these charges is minimum at P on the line through A and B. What is (are) the distance (s) of P from A?
(A) \(\frac{d}{3}\) units to the right of \(A\)
(B) \(\frac{d}{3}\) units to the left of \(A\)
(C) \(\frac{d}{5}\) units to the right of \(A\)
(D) d units to the left of \(A\)
Ans: (A)
