A conductor of cross-sectional area $1 imes 10^{-6} m^2$ carries a current of 4A. If the number density of free electrons is $10^{28} m^{-3}$, and the charge on an electron is $1.6 imes 10^{-19} C$, what is the magnitude of the drift velocity of the electrons, assuming they all contribute to the current?

What is the SI unit of drift velocity?

A current $I$ is passing through a wire having two sections $P$ and $Q$ of uniform diameters $d$ and $d/2$ respectively. If the mean drift velocity of electrons in sections $P$ and $Q$ is denoted by ${v_{\rm{P}}}$ and ${v_{\rm{Q}}}$ respectively, then

Every atom makes one free electron in copper. If ${\rm{1}}{\rm{.1 }}\,{\rm{A}}$ Current is flowing in the wire of copper having ${\rm{1 mm}}$ diameter, then the drift velocity(approx.) will be (density of copper = $9\,\, imes \,\,{10^3}\,\,{\rm{k}}\,{\rm{g}}{{\rm{m}}^{ - 3}}$ and atomic weight of copper =${\rm{63}}$)

A copper wire of cross-sectional area $2.0\,\,m{m^2}$, resistivity $= 1.7\,\, imes \,\,{10^{ - 8}}\,\,{\rm{\Omega }}\,{\rm{m}}$, carries a current of $1\,A$. The electric field in the copper wire is

Two wires of the same material but of different diameters carry the same current $i$. If ratio of their diameters is ${\rm{1:2}}$, then the corresponding ratio of their mean drift velocities will be

In above question, if length is doubled, the drift velocity

The amount of charge $Q$ passed in time t through a cross-section of a wire is $Q = 5\,{t^2} + \,\,3\,t + \,\,1$.The value of current at time $t = 5\,\,s$ is

The current flowing through a wire depends on time as $I = 3{t^2} + 2t + 5$. The charge flowing through the cross-section of the wire in time from $t = 0$ to $t = 2\,\sec$. Is

A potential difference $V$ is applied to a copper wire of length $l$ and thickness $d$. If $V$ is doubled, the drift velocity

A source of ${\rm{e}}{\rm{.}}\,{\rm{m}}\,{\rm{.f}}{\rm{.}}\,E = 15\,\,V$ and having negligible internal resistance is connected to a variable resistance so that the current in the circuit increases with time as $i = 1.2\,\,t\, + \,\,3$. Then, the total charge that will flow in first five seconds will be