A) terminal velocity of sphere = v
B) terminal velocity of sphere < v
C) terminal velocity of sphere > v
D) sphere never attains terminal velocity
Correct Answer: B
Solution :
The terminal velocity of the sphere \[v=\frac{2}{9}\frac{{{r}^{2}}(\rho -\sigma )g}{\eta }\] \[\therefore \] \[v=0\] (\[\because \]in vacuum \[g=0\]) Hence, the sphere never attains terminal velocity in vacuum.
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