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Students perform an experiment where they explore electric charge, using a positively-charged non-conducting rod and an initially uncharged metal sphere. In one part of the experiment, the rod is brought near to the metal sphere, and while the rod is still nearby the sphere is grounded. Then the grounding wire is removed, and lastly the rod is removed.

Which of the following is the best description of the charge on the sphere after the grounding wire and rod have both been removed?

A

The entire sphere is positively charged.

B

The entire sphere is negatively charged.

C

One side of the sphere is more negatively-charged; and the other side is more positively-charged.

D

The sphere is completely uncharged.

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