Published by:
CGP EDU Academic Team
Published on: September 12, 2026
A spherical body of mass 
and radius 
is allowed to fall in a medium of coefficient of viscosity 
. The time in which its velocity rises to 0.63 times the critical velocity 
is known as 
. 
is dimensionally represented by
A
B
C
D
none of the above
Text Solution
Verified by ExpertsThe correct answer is:
D
[T] = [M0 L0 T1] as F = 6 πη rv
[ η ] = 
= 
= [ML–1 T–1]
⇒ 
= [L3T]
= 
= [L–1 T2]
None of the three options have dimension of time.
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