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Two identical particles of mass 'm' and charge q are shot at each other from a very great distance with an initial speed v.

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Two identical particles of mass 'm' and charge q are shot at each other from a very great distance with an initial speed v. The distance of closest approach of these charges is- 

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Correct Option :- . (B)

Explanation :-

 Using law of conservation of mechanical energy Initial K.E. = Final P.E

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