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Sphere A and Sphere B, two hollow metallic spheres of equal size and mass, are each given an electric charge, $–Q$ and $+Q$. Sphere A hangs by a non-conducting thread, while Sphere B is attached to a non-conducting rod. As the two spheres are brought close together, Sphere A swings upwards until its string makes a $45^\circ$ angle with the vertical.

Which of the following statements is inconsistent with the scenario above?

A

The gravitational force between Sphere A and the earth is equal to the electric force between Sphere A and Sphere B.

B

Every particle with charge in Sphere A attracts every particle with charge in Sphere B.

C

Every particle with mass in the earth attracts every particle with mass in Sphere A.

D

The vector sum of the gravitational force on Sphere A and the electric force on Sphere A is directed down and to the right.

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