# A student rubs a glass rod with a silk cloth. The glass rod becomes positively charged. Explain why the glass rod becomes positively charged and describe the charge left on the silk cloth after rubbing.

> Eduqas GCSE Physics — 7.3 Static electricity – forces and electric fields · Explain · 4 marks

## Mark scheme (4 marks)

1. Electrons are transferred from the glass rod to the silk cloth (during rubbing)
2. The glass rod loses electrons and so has more positive charge than negative charge / gains a positive charge
3. The silk cloth gains electrons / has more electrons than protons
4. The silk cloth is negatively charged

## Key terms

- [positively charged](https://www.gradenine.co.uk/glossary/positively-charged)

## Related

- [Revision notes for Eduqas GCSE Physics](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/a-student-rubs-a-glass-rod-58741b4d) · Published by Druglandscape Ltd.