A) \[\operatorname{r}=2{{r}_{0}};l=2{{l}_{0}}\]
B) \[\operatorname{r}=2{{r}_{0}};l={{l}_{0}}\]
C) \[\operatorname{r}={{r}_{0}};1=2{{1}_{0}}\]
D) \[\operatorname{r}={{r}_{0}};1={{1}_{0}}\]
Correct Answer: B
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