Question

A charged particle $q$ is shot with speed $v$ towards another fixed charged particle $Q$. It approaches $Q$ upto a closest distance r and then returns. If $q$ were given a speed $2v$, the closest distance of approach would be

• A. $r$
• B. $2r$
• C. $\frac r2$
• D. $\frac r4$

Answer 1

Answer: (D)

$\frac r4$

Answer 2

The correct option is (D): $\frac r4$.