A recycling machine passes a small charged plastic flake between two large parallel electrodes. The electrode on the left is positive and the electrode on the right is negative. The electric field is uniform between the electrodes.
The flake enters the central region moving upwards and its path curves towards the left electrode. Point P is near the start of the curved path and point Q is later on the path, closer to the left electrode. Both points are within the uniform field. The flake carries a constant charge.
Which conclusion about the flake and the electric force is correct?
The flake is positive, and the electric force has the same size at P and Q.
The flake is negative, and the electric force is larger at Q because its path has curved.
The flake is positive, and the electric force reverses after it passes the centre of the gap.
The flake is negative, and the electric force has the same size at P and Q.
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.