A solid ball of volume V is dropped into a viscous liquid. It experiences a viscous drag equal to F. If a solid ball of volume 2 V and of the same material is dropped into the same liquid, the viscous drag will be
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a
F
b
2F
c
4 F
d
8 F
answer is B.
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Detailed Solution
We know thatViscous drag + Buoyancy = weight of the ballF+Vσg=Vρg and F′+2Vσg=2Vρg From eqs. (i) and (ii), we get F'=2 F