When a particle with charge \(+q\) is thrown with an initial velocity \(v\) towards another stationary change \(+Q,\) it is repelled back after reaching the nearest distance \(r\) from \(+Q.\) The closest distance that it can reach if it is thrown with an initial velocity \(2v,\) is:
1. | \(\dfrac{r}{4}\) | 2. | \(\dfrac{r}{2}\) |
3. | \(\dfrac{r}{16}\) | 4. | \(\dfrac{r}{8}\) |
1. | zero | 2. | \(\dfrac{-q^2}{4\pi\varepsilon_0d}\) |
3. | \(\dfrac{-q^2}{4\pi\varepsilon_0d}\Big(3-\dfrac{1}{\sqrt2}\Big)\) | 4. | \(\dfrac{-q^2}{4\pi\varepsilon_0d}\Big(6-\dfrac{1}{\sqrt2}\Big)\) |