Monday Homework Problem 2.9 An electroscope is initially uncharged. When a charg

Question

Monday Homework Problem 2.9 An electroscope is initially uncharged. When a charged rod is brought near the bolt of a leaf electroscope, but does not touch the bolt, the leaves deflect. No charge is transferred from the rod to the electroscope during this process. What happens to the leaves if the charged object is moved away from the electroscope? Select One of the Following (a) The leaves continue to deflect. (b) The leaves return to their original position, hanging straight down. (c) The leaves return to their original position, hanging straight down, but then slowly separate over t (d) The leav (e) The leaves' separation is reduced by half. ime es return to their original position, hanging straight down, touch, then quickly separate.

Explanation / Answer

An electroscope is a device with two gold leaves hanging side by side. Initially net charge on the elctroscope is zero.No charges on gold leaves. The gold leaves hang straight down.

When a positively charged rod is brought near the bolt of a leaf electroscope , a negative charge is induced on the bolt and positive charge is induced on the leaves. As the charge on the two leaves is positive , the two leaves repel each other ( deflect ).

When the charged rod is moved away from the electroscope , the charge on the leaves again becomes zero, and the leaves fall back to their original position.

Answer is

b) The leaves return to their original position, hanging straight down.

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