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A charged particle of charge \( \mathrm{Q} \) is held fixed and another charged particle of mass \( m \) and charge \( q \) (of the same sign) is released from a distance \( r \). The impulse of the force exerted by the external agent on the
\( \mathrm{P} \) fixed charge by the time distance between \( Q \) and q becomes \( 2 r \) is

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(A) \( \sqrt{\frac{\mathrm{Qq}}{4 \pi \in_{0} \mathrm{mr}}} \)
(B) \( \sqrt{\frac{\mathrm{Qqm}}{4 \pi \in_{0} r}} \)
(C) \( \sqrt{\frac{Q q m}{\pi \in_{0} r}} \)
(D) \( \sqrt{\frac{\mathrm{Qqm}}{2 \pi \in_{0} \mathrm{r}}} \)
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