A) \[\frac{r}{4}\]
B) \[\frac{r}{2}\]
C) \[2r\]
D) \[r\]
E) \[\frac{3}{2}r\]
Correct Answer: A
Solution :
\[\frac{1}{2}m{{v}^{2}}=\frac{kQq}{{{r}_{1}}}\] ...(i) \[\frac{1}{2}m.4{{v}^{2}}=\frac{kQq}{{{r}_{2}}}\] ?. (ii) From Eqs. (i) and (ii), we can say \[\frac{{{r}_{1}}}{{{r}_{2}}}=4\] \[{{r}_{2}}=\frac{r}{4}\]You need to login to perform this action.
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