A particle located between two parallel metal plates has a charge of $8 \times 10^{-19}\,\text{C}$. The potential difference (p.d.) across the plates is $2000\,\text{V}$. The electric field exerts a force of $3.2 \times 10^{-13}\,\text{N}$ on the particle. What is the separation between the plates?
- A$5\,\text{mm}$
- B$8\,\text{mm}$
- C$5\,\text{cm}$
- D$8\,\text{cm}$