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Q.

An air bubble of radius 1cm rises from the bot-tom portion through a liquid of density 1.5g/cc at constant speed of 0.25cm/s. If the density of air is neglected the coefficient of viscosity of the liquid is approximately (In pa. s)

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a

13,000

b

11,300

c

130

d

13

answer is C.

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Detailed Solution

r = 1cm; r = 10-2m; Vt = 0.25cm/sec = 0.25 x 10-2m/sec; ρm = 0when the bubble attain terminal velocity, resultant force on it must be zero. Viscous drag - Buoyant force = 0
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