An elementary particle of mass $m$ and charge $+e$ is projected with velocity $v$ at a much more massive particle of charge $Ze$,where $Z > 0$. What is the closest possible approach of the incident particle?
- A$\frac{Ze^2}{2\pi \varepsilon_0 mv^2}$
- B$\frac{Ze}{4\pi \varepsilon_0 mv^2}$
- C$\frac{Ze^2}{8\pi \varepsilon_0 mv^2}$
- D$\frac{Ze}{8\pi \varepsilon_0 mv^2}$
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