ON23 P42 Q5 Uniform E-field and Oil Droplet | Oct/Nov 2023 | Cambridge A Level 9702 Physics

9702/42/O/N/23
5 (a) State Coulomb’s law.
(b) Two identical oil droplets are in a vacuum. The centres of the droplets are a distance of
3.8 × 10-6 m apart. The droplets have equal charge and exert an electric force on each other
of magnitude 6.3 × 10-17 N. Determine the magnitude of the charge on each droplet.
(c) One of the oil droplets in (b) is now placed between two horizontal metal plates, as shown in
Fig. 5.1. A potential difference (p.d.) of 1200 V is applied between the plates, with the top plate at the
higher potential. The oil droplet is stationary and in equilibrium.
(i) State the sign of the charge on the oil droplet.
(ii) On Fig. 5.1, draw four lines to represent the electric field between the plates.
(iii) The distance between the plates is 5.2 cm.
Determine the mass of the oil droplet.
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