First slide

Viscosity

Question

A copper ball of radius r is moving with a uniform velocity u in the mustard oil. The dragging force acting on the ball is F. The dragging force on the copper ball of radius 2r
moving with uniform velocity 2u in the mustard oil is

Moderate

A

F
B

2F
C

4F
D

8F

Solution

$F = 6 πηru, F^{'} = 6 πη (2 r) (2 u) = 4 F$

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