Asked by violet

A glass rod with yellow crosses on it touches a sheet of silk covered with negative signs on it. The sheet of silk is sticking to the glass rod in several places.
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A student is going to produce static charge in a glass rod by rubbing it with a piece of silk. Which method of transferring charge does this image illustrate?

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Answered by GPT-5 mini AI
Charging by friction (triboelectric effect) — electrons are transferred when the glass is rubbed with silk, leaving the glass positive and the silk negative so they attract and stick.