A positively charged rod is brought close to an uncharged electroscope. While the rod is close, one's finger touches the far side of the metal ball on the electroscope. The finger is removed and then the rod is taken away. The electroscope is
A) negatively charged.
B) positively charged.
C) uncharged.

Question

Quizplus · Accepted Answer

When the positively charged rod is brought close, it induces a negative charge on the side of the electroscope near the rod and a positive charge on the far side. Touching the far side allows electrons to flow from the ground (through the finger) to neutralize the positive charge. When the finger is removed and then the rod is taken away, the electroscope retains a net negative charge.

A Positively Charged Rod Is Brought Close to an Uncharged