Two Spheres Carry Electric Charge,and a Third Charged Sphere Is

Two spheres carry electric charge,and a third charged sphere is now placed somewhere on the line that runs through the two spheres' centers.If the result of the placement of the third charge is that there is no net electrostatic force on each of the two original spheres,what can be said?

A) The original spheres carried charges of opposite sign.
B) The original spheres carried charges of the same sign.
C) The original spheres carried charges of equal magnitude.
D) The new charge is placed equidistant from each of the two original charges.
E) None of the choices may be said with certainty.

Correct Answer:

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