A) $ {r^{5}} $
B) $ {r^{2}} $
C) $ {r^{3}} $
D) $ {r^{4}} $
صحیح جواب: A
طاقت $ \text{=6}\pi \eta rV _{T}\cdot V _{T}=6\pi \eta rV_T^{2} $
$ V _{T}\propto r^{2} $
$ \Rightarrow \text{Power }\propto {r^{5}} $
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