Terminal Velocity

In Milikan's oil drop experiment, a charged drop falls with terminal velocity V. If an electric field E is applied in vertically upward direction then it starts moving in upward direction with terminal velocity 2V. If magnitude of electric field is decreased to (E)/(2) , then terminal velocity will become

Sixty four spherical rain drops of equal size are falling vertically through air with a terminal velocity 1.5ms^(-1) . If these drops coalesce to form a big spherical drop, then terminal velocity of big drop is:

A spherical ball falls through viscous medium with terminal velocity v . If this ball is replaced by another ball of the same mass but half the radius, then the terminal velocity will be (neglect the effect of buoyancy.)

Eight identical droplets, each falling under gravity in the earth's atmosphere with terminal velocity v , combine to form a single drop. The terminal velocity of single drop and drag force on it are calculated. Find the correct statement from the following.

At a given place two rain drops of volumes V and 8V are falling down with terminal velocities. Their terminal velocities are in the ratio

At a given place two rain drops of volumes V and 8V are falling down with terminal velocities.Their terminal velocities are in the ratio

The diameter of ball A is half of that of B. The ratio of their terminal velocities will be

The ratio of the terminal velocities of two drops of radii R and R//2 is