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A water drop of radius 1 μ m falls in a situation where the effect of buoyant force is negligible. Co-efficient of viscosity of air is 1.8 × 10 –5 Nsm –2 and its density is negligible as compared to that of water (10 6 gm –3 ). Terminal velocity of the water drop is (Take acceleration due to gravity = 10 ms –2 )

1. 145.4 × 10 –6 ms –1
2. 118.0 × 10 –6 ms –1
3. 132.6 × 10 –6 ms –1
4. 123.4 × 10 –6 ms –1

Correct answer: 123.4 × 10 –6 ms –1

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