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Q.

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

4 F

b

2F

c

8 F

d

F

answer is B.

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Detailed Solution

We know that
Viscous drag + Buoyancy = weight of the ball
F+Vσg=Vρg and F′+2Vσg=2Vρg From eqs. (i) and (ii), we get F'=2 F

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