A pollen grain carries a negative charge. It drifts between two horizontal parallel plates, where the electric field is directed upwards. It passes position J, close to the lower plate, and then position K, midway between the plates. Both positions are well away from the edges of the plates.
Which compares the electric forces on the pollen grain at J and K?
Both forces act upwards, and the force at J is larger.
Both forces act downwards, and they are equal in size.
Both forces act upwards, and they are equal in size.
Both forces act downwards, and the force at J is larger.
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.