An oil drop carrying a charge q has a mass m kg. it is falling freely in air with terminal speed v. the electric field required to make, the drop move upwards with the same speed is

An oil drop carrying a charge q has a mass m kg. If is falling freely in air with terminal speed v. The electric field required to make the drop move upwards with the same speed is

An oil drop, carrying six electronic charges and having a mass of 1.6xx10^(-12)g , falls with some terminal velocity in a medium. What magnitude of vertical electric field is required to make the drop move upward with the same speed as it was formerly moving down ward with ? Ignore buoyancy.

An oil drop, carrying six electronic charges and having a mass of 1.6xx10^(-12)g , falls with some terminal velocity in a medium. What magnitude of vertical electric field is required to make the drop move upward with the same speed as it was formerly moving down ward with ? Ignore buoyancy.

An oil drop having a charge q and apparent weight W falls with a terminal speed v in absence of electric field . When electric field is switched on it starts moving up with terminal speed v. The strength of electric field is

An oil drop having a charge q and apparent weight W falls with a terminal speed v in absence of electric field . When electric field is switched on it starts moving up with terminal speed v. The strength of electric field is

What intensity of electric field is required to keep a drop of water with mass m suspended in air. Take charge = e

The terminal speed v of a rain water drop in air is :

An oil drop of radius r carrying a charge q remain stationary in the presence of electric field of intensity E. If the density of oil rho , then