A student charges a metal dome using a machine. The charge on the dome increases steadily. A spark then jumps from the dome to an earthed metal sphere held a few centimetres away.
Explain why a spark jumps from the dome to the earthed sphere.
The earthed sphere is now held closer to the dome. Suggest what happens to the charge needed on the dome before a spark jumps.
40 exam-style questions on AQA GCSE Physics 2.5 Static electricity, covering 2.5.1 Static charge and 2.5.2 Electric fields. Each one has a worked solution and a mark scheme showing where the marks go.