A) \[ln\left( \frac{{{r}_{2}}}{{{r}_{1}}} \right)\]
B) \[\frac{\left( {{r}_{2}}-{{r}_{1}} \right)}{\left( {{r}_{1}}{{r}_{2}} \right)}\]
C) \[\left( {{r}_{2}}-{{r}_{1}} \right)\]
D) \[\frac{{{r}_{1}}\,{{r}_{2}}}{({{r}_{2}}-{{r}_{1}})}\]
Correct Answer: D
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