The answer is NOT A. A metal conducting sphere is grounded as shown to the right

Question

The answer is NOT A.

A metal conducting sphere is grounded as shown to the right. A positively charged object is brought near but does not touch the metal sphere. With the charged object and the metal sphere in the locations drawn at the right with the ground attached, does the metal sphere have a net charge? If so, what is the sign of the net charge? Select One of the Following: The metal sphere has zero net charge. The metal sphere has a net positive charge. The metal sphere has a net negative charge.

Explanation / Answer

Answer is :C the metal shere has a net negative charged

Reason: A positively charged tube is brought near to (without touching) the neutral sphere. The presence of the positively charged tube forces electron movement from the left to the right side of the sphere. This movement of electrons is merely a reaction to the presence of positive charge (like charges repel). Once touched by the ground, the electrons leave the sphere. When the tube is moved away, there is an overall negative charge left on the sphere.

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