Question

When the cap of a gold leaf electroscope is touched with a glass rod rubbed with silk, the leaves of the electroscope collapse. What can be concluded about the gold leaf electroscope?

• A. it has positive charge
• B. it has negative charge
• C. it is electrically neutral
• D. the information is not sufficient

Answer 1

The correct option is B

it has negative charge

1. When a glass rod is rubbed with a piece of silk then it acquires a positive charge.
2. According to the question when this glass rod is touched with the gold leaf electroscope the leaves of the electroscope collapse it is possible only when the electroscope is already negatively charged.
3. Opposite charges attract each other and the same charges repel each other.

Hence, option B is correct.