Question

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• A£® $\frac{2¦Ð{R}_{2}{r}_{1}}{T{r}_{2}}$
• B£® $\frac{4¦Ð{R}_{2}{r}_{1}}{T{r}_{2}}$
• C£® $\frac{2¦Ð{R}_{2}{R}_{1}}{T{r}_{2}}$
• D£® $\frac{4¦Ð{R}_{2}{R}_{1}}{T{r}_{1}}$

Answer 1

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