A) only \[1/r\]
B) \[m/r\]
C) \[{{(m/r)}^{1/2}}\]
D) only m
Correct Answer: B
Solution :
As the term that velocity in a fluid is given by \[{{V}_{T}}=\frac{2}{9}\frac{{{r}^{2}}(P-\sigma )}{\eta }\,g\] \[=\frac{2}{9}\frac{({{r}^{3}}g)\,\left( 1-\frac{\sigma }{\rho } \right)\,g}{r\,n}\] \[\therefore \] \[{{V}_{T}}\propto \left( \frac{m}{r} \right)\] \[(\because \,\,m\propto {{r}^{3}}\rho )\]
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