A Small Charged Plastic Ball Is Vertically Above Another Charged

question 40

Multiple Choice

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.

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