Two parallel plates separated by a distance of $5\,mm$ are kept at a potential difference of $50\,V.$ $A$ particle of mass $10^{-15}\,kg$ and charge $10^{-11}\,C$ enters in it with a velocity $10^7\,m/s.$ The acceleration of the particle will be
- A$10^8\,m/s^2$
- B$5 \times 10^5\,m/s^2$
- C$10^5\,m/s^2$
- D$2 \times 10^3\,m/s^2$
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