Problem A15:
In the figure above, three small "point" charged objects are located on the y-axis.
One is at the origin, with a charge of n_{2}q. The second is at
y= + √ 3 d
with a charge of n_{1}q. Finally, the third object is at
y= - √ 3 d
with a charge of n_{1}q. What is the electric field at a point on the x-axis located
a distance of d from the origin? That is, if **E** = n_{3} kq/d^{2}
**i**, what is n_{3} ?

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