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 n1q.  The other object is located at (+3d,0) and 
has a 
charge of n2q.  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 n3 in the 
equation V(a)-V(b)=n3 kq/d ?

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