Physics (AS & A Level) · May / June 2021 · Paper 11 · Question 31

An oil drop of mass 2.6 × 10⁻¹⁵ kg and with a charge of –4.8 × 10⁻¹⁹ C is in a vacuum between two horizontal plates. The plates have a separation of 2.0 cm and a potential difference (p.d.) between them of 1200 V, as shown. Which statement describes the motion of the oil drop?

1. AIt is stationary.
2. BIt has a downward acceleration of 9.7 m s⁻².
3. CIt has an upward acceleration of 1.3 m s⁻².
4. DIt has an upward acceleration of 11 m s⁻².

As printed in the paper