Two large horizontal parallel plates produce a uniform electric field in the central region. The upper plate is negative and the lower plate is positive.
A negative bead is moved from the centre to a position nearer the upper plate, remaining in the uniform region. Its charge does not change.
Which describes the electric force before and after the move?
Downwards at both positions; unchanged in size.
Upwards at both positions; unchanged in size.
Downwards at both positions; greater nearer the upper plate.
Upwards at both positions; greater nearer the upper plate.
80 exam-style questions on Edexcel GCSE Physics 11.2 Uses, dangers and electric fields, covering 11.2.1 Uses of electrostatic charge, 11.2.2 Dangers of sparking, 11.2.3 Electric fields, and 11.2.4 Electric fields and static electricity. Each one has a worked solution and a mark scheme showing where the marks go.