Physics (AS & A Level) · Feb / March 2020 · Paper 12 · Question 31

A negatively charged oil drop is held stationary, equidistant between two plates connected to a high voltage supply, as shown. Which change would not increase the upward electrical force on the drop?

1. Adecreasing the distance between the plates whilst keeping the drop equidistant from them
2. Bincreasing the amount of negative charge on the drop
3. Cincreasing the supply voltage
4. Dmoving the drop closer to the positive plate

As printed in the paper