Two large parallel plates X and Y are separated by a distance of $5.0\,\text{mm}$ and linked to the terminals of a $200\,\text{V}$ d.c. supply, as shown. At P, a small oil drop has one extra electron. What is the size of the electrostatic force on the oil drop caused by the electric field between the plates?
- A$6.4 \times 10^{-15}\,\text{N}$
- B$6.4 \times 10^{-18}\,\text{N}$
- C$1.6 \times 10^{-19}\,\text{N}$
- D$4.0 \times 10^{-24}\,\text{N}$