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Two identical charged particles each car...

Two identical charged particles each carrying charge `q=0.1mC` and of mass `m=10 mg` are projected along two parallel lines separated by a distance `'l'`, with equal speed `V_(0)=10^(4)m//s` in opposite directions. In the beginning electrostatic interaction between the charges can be ignored due to a large distance between them. The minimum distance between the particles is found to be `12cm`. . The value of `l` is equal to

A

`6 cm`

B

`8cm`

C

`12cm`

D

`4cm`

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