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A proton of mass m and charge e is proje...

A proton of mass m and charge e is projected from a very large distance towards an `alpha-particle` with velocity v. Initially `alpha-particle` is at rest, but it is free to move. If gravity is neglected, then the minimum separation along the straight line of their motion will be

A

`e^2/4pi epsilon_0mv^2`

B

`5e^2/pi epsilon_0mv^2`

C

`2e^2/pi epsilon_0mv^2`

D

`4e^2/pi epsilon_0mv^2`

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