A charged particle \( q \) is shot from a large distance with speed \( \mathrm{v} \) towards a...

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A charged particle \( q \) is shot from a large distance with speed \( \mathrm{v} \) towards a fixed charged particle. It approaches \( Q \) upto a closest distance \( \mathrm{r} \) and then returns. If \( q \) were given a speed \( 2 v \) , the closest distance of approach would be
(a) \( r \)
(b) \( 2 r \)
(c) \( \frac{r}{2} \)
(d) \( \frac{r}{4} \)
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