(a(i))[1]
State what the direction of an electric field means.
(a(ii))[3]
On Fig. 9.1, draw lines to show this uniform field. Add arrows to the lines so that the field direction is clear.
(b(i))[2]
Suggest, in terms of forces, why the oil drop remains stationary.
(b(ii))[2]
State and explain what happens to the oil drop.