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Two uniformly charged non–conducting spheres on insulating bases are placed on an air table.

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Two uniformly charged non–conducting spheres on insulating bases are placed on an air table. Sphere A has a charge +3Q coulombs and sphere B has a charge +Q coulombs. Which of the following correctly illustrates the magnitude and direction of the electrostatic force between the spheres when they are released?

(E) None of the above

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The correct option is: (D)

Explanation:

Newton’s third law requires the forces be equal and opposite. This eliminates choices A, B and C. Since they both positive, the force is repulsive.

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