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An alpha-particle accelerated through V ...

An `alpha`-particle accelerated through V volt is fired towards a nucleus . Its distance of closest approach is r . If a proton accelerated through the same potential is fired towards the same nucleus , the distance of closest approach of the proton will be :

A

r

B

2r

C

`(r)/(2)`

D

`(r)/(4)`

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The correct Answer is:
A
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