Physics (AS & A Level) · Feb / March 2016 · Paper 12 · Question 29

Two large parallel plates X and Y are placed a distance of 5.0 mm apart and connected to the terminals of a 200 V d.c. supply, as shown. A small oil drop at P carries one excess electron. What is the magnitude of the electrostatic force acting on the oil drop due to the electric field between the plates?

1. A6.4 × 10^–15 N
2. B6.4 × 10^–18 N
3. C1.6 × 10^–19 N
4. D4.0 × 10^–24 N

As printed in the paper