A) \[1{{r}^{2}}\]
B) \[1\,r\]
C) \[\,r\]
D) \[{{r}^{2}}\]
Correct Answer: D
Solution :
According to formula \[v=\frac{2{{r}^{2}}(\rho -\sigma )g}{{}}\] So, \[v\propto {{r}^{3}}\]
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