Coulomb's Law: A small charged plastic ball is vertically above another charged small ball in a frictionless test tube as shown in the figure. The balls are in equilibrium a distance d apart. If the charge on each ball is doubled, the equilibrium distance between the balls in the test tube would become
A. 
d.
B. 2d.
C. 4d.
D. 8d.
E. d/4.
Answer: B
Physics & Space Science
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