4. A negatively charged rubber rod is brought near the knob ofa positively charg

Question

4. A negatively charged rubber rod is brought near the knob ofa positively charged electroscope. The result is that: A) electroscope leaves will move farther apart B) the rod will lose its charge C) electroscope leaves will tend to collapse D) electroscope will become discharged E) nothing noticeable will happen 4. A negatively charged rubber rod is brought near the knob ofa positively charged electroscope. The result is that: A) electroscope leaves will move farther apart B) the rod will lose its charge C) electroscope leaves will tend to collapse D) electroscope will become discharged E) nothing noticeable will happen

Explanation / Answer

(C) the electroscope leaves will tend to collapse. the reason is that the neg rod pulls up (opposite chargesattract) some of the + charges off the leaves, so that the leavesare LESS positively charges than initially, and thus with fewercharges on them, they do not repel each other as strongly as beforebringing the rod close.

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