A horizontal beam of electrons is directed between two horizontal parallel plates that are $2.0\,\text{cm}$ apart. The top plate is at an electrical potential of $+4.0\,\text{V}$, and the bottom plate is at an electrical potential of $-4.0\,\text{V}$. What is the force on each electron while it is between the plates?
- A$3.2 \times 10^{-17}\,\text{N}$ downwards
- B$3.2 \times 10^{-19}\,\text{N}$ upwards
- C$6.4 \times 10^{-19}\,\text{N}$ downwards
- D$6.4 \times 10^{-17}\,\text{N}$ upwards