The velocity of a small ball of mass ‘\( m \)’ and density \( d_1 \), when dropped in 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:
\( mg \left[ 1 - \frac{d_1}{d_2} \right] \)
\( mg \left( 1 - \frac{d_2}{d_1} \right) \)
\( mg \left( \frac{d_1}{d_2} - 1 \right) \)
\( mg \left( \frac{d_2}{d_1} - 1 \right) \)
