An electron moves into the region between two parallel plates that are $5.0\ \text{cm}$ apart and are kept at electric potentials of $+2000\ \text{V}$ and $-500\ \text{V}$, respectively. What is the electric force acting on the electron?
- A$1.6 \times 10^{-15}\ \text{N}$
- B$4.8 \times 10^{-15}\ \text{N}$
- C$6.4 \times 10^{-15}\ \text{N}$
- D$8.0 \times 10^{-15}\ \text{N}$