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The velocity of a small ball of mass ‘m’ and density d 1 , when dropped in a container filled with glycerine, becomes constant after some time. If the density of glycerine is d 2 , then the viscous force acting on the ball, will be

1. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 2 1 d d 1 mg
2. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 1 2 d d 1 mg
3. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 1 d d mg 2 1
4. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 1 d d mg 1 2

Correct answer: ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 1 2 d d 1 mg

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