In the figure above, there is a charged non-conducting ring of radius 3d, and a
small charged object. The ring has a charge of n1Q, and the center of
the ring is located on the x-axis at x=-4d. The small "point" object has a charge
of n2Q and is located on the x-axis at x=d. What is the electric field
at the origin? That is, if the electric field at the origin equals
E = n3 kQ/d2 i , then what is n3 ?
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