In an aerosol research experiment, a negatively charged dust particle, PPP, is held stationary in a vacuum chamber. A second negatively charged dust particle, QQQ, is introduced into the chamber near particle PPP.
Explain, in terms of electric fields, why an electrostatic force is exerted on particle QQQ.
3 exam-style questions on Edexcel GCSE Physics 11.2 Uses, dangers and electric fields. Each one has a worked solution and a mark scheme showing where the marks go.