Problem A7:
In the figure above are two point objects. Both are located on the x-axis.
One is located at (-3d,0) and has a charge of n_{1}q. The other object is located at (+3d,0) and
has a
charge of n_{2}q. Find the electrical potential difference between the points a and b located on
the y-axis. Point a is at the origin (0,0), and point b is at (0,4d). What is n_{3} in the
equation V(a)-V(b)=n_{3} kq/d ?

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