A) \[\frac{{{r}^{2}}g}{9\eta }(\rho -2\sigma )\]
B) \[\frac{{{r}^{2}}g}{9\eta }(2\rho -\sigma )\]
C) \[\frac{{{r}^{2}}g}{9\eta }(\rho -\sigma )\]
D) \[\frac{2{{r}^{2}}g}{9\eta }(\rho -\sigma )\]
Correct Answer: C
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