Physics › Section M · Electric charge and field › Topic M.5
Electric forces in biology and technology
The same rules that make a balloon cling to a wall shape the molecules of life, run office copiers and clean the smoke from power stations. They also explain lightning, and why a metal box keeps you safe from it.
In this topic
- Electrostatics at work
- Water: a polar molecule that screens charge
- Worked example: two ions in water
- Charges that hold life together
- The Van de Graaff generator
- Worked example: how much charge a dome can hold
- The photocopier
- Printing, painting and cleaning air
- Lightning
- Faraday cages
- Common mistakes to avoid
- Key takeaways
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