Coulomb's Law: A particle of charge +2q is placed at the origin and particle of charge -q is placed on the x-axis at x = 2a. Where on the x-axis can a third positive charge be placed so that the net electric force on it is zero?
A. 3.4a
B. 6.8a
C. 8.6a
D. 9.3a
E. 1.0a
Answer: B
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