y
↑
$q_3$
d
$q_1$
$q_2$
x
d
d
The figure above shows a coordinate system with three point charges $q_1$, $q_2$ and $q_3$ placed at the three positions shown. Find the net potential at the origin if $q_1 = 2q$, $q_2 = 4q$ and $q_3 = 3q$.
8kq/d
12kq/d
10kq/d
9kq/d
5kq/d
7kq/d
4kq/d
6kq/d