The potential difference between two parallel plates is $10^4 ~V$. If the plates are separated by $0.5 ~cm$,the force on an electron between the plates is
- A$32 \times 10^{-13} ~N$
- B$0.32 \times 10^{-13} ~N$
- C$0.032 \times 10^{-13} ~N$
- D$3.2 \times 10^{-13} ~N$
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