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

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

Write the expression for the force experienced by a charge q moving with a velocity v in an electric field E.

A charged oil drop falls with terminal velocity v_(0) in the absence of electric field. An electric field E keeps it stationary. The drop acquires charge 3q, it starts moving upwards with velocity v_(0) . The initial charge on the drop is

A charged oil drop falls with terminal velocity v_(0) in the absence of electric field. An electric field E keeps it stationary. The drop acquires charge 3q, it starts moving upwards with velocity v_(0) . The initial charge on the drop is

A charged oil drop falls terminal velocity V_0 in the absence of electric field . An electric field E keeps it stationary . The drop acquires additional charge q and starts moving upwards with velocity V_(0) . The intial charge on the drop was .

Two oil drop in millikon's experiment are falling with terminal velocity in the ratio 1:4 . The rario of their de-Broglie wave length is

Drift velocity in a metallic conductor: At room temperature there are large number of free electrons having zero average velocity, but when electric field is applied, the free electrons start moving in a direction opposite to the direction of the applied field with a velocity called drift velocity. The magnitude of electric field set up across the ends of the conductor is given by