An oil drop of radius `10^(-6)m` carries a charge equal to that on an electron. If the density of the oil is `2xx10^(3)kg m^(3)`, find the electric field required to keep it stationary. Take `e=1.6xx10^(-19)C` and `g=9.8 ms^(-2)`.

An oil drop has 8.01 xx 10^(-19) C charg .Calculate the number of electrons in this drop.

An oil drop has 8.01xx10^-19 C charge calculate the number of electrons in this drop.

An oil drop has 6.39 xx 10^(-19)C charge .How many electrons does this oil drop has ?

An oil drop has 6.39 xx 10^(-19)C charge .How many electrons does this oil drop has ?

A water droplet of radius 1 micron in Milikan oil drop appartus in first held stationary under the influence of an electric field of intensity 5.1xx10^(4) NC^(-1) . How many excess electrons does it carry ? Take e = 1.6xx10^(-19) C, g = 9.8 ms^(-2) and density of water of = 10^(3) kg m^(-3) .

A copper wire of 2.5 xx 10^-6 m^2 area carries a current of 1.6A. If the number density of the electrons in the wire is 8 xx 10^28//m^3 , then calculate the drift speed of the electrons in the wire (e = 1.6 xx 10^-19 C)