A cylindrical copper conductor with radius $r_1$ carries a current $I$. If the radius is doubled to $2r_1$ while keeping the current the same, and assuming the electric field within the conductor remains uniform, how does the drift velocity of electrons change?

The electron dirft speed is small and the charge of the electron is also small but still, we obtain large current in a conductor. This is due to

A cylindrical copper conductor has a resistance of $2 \Omega$. Its length is 4 m and its cross-sectional area is $2 imes 10^{-4} m^2$. If a potential difference of 4 V is applied across its ends, calculate the current density.

In a closed circuit, the current $I$ (in ampere) at an instant of time t(in second) is given by $I = 4 - 0.08\,\,t$. The number of electrons flowing in ${\rm{50}}\,\,{\rm{s}}$ through the cross-section of the conductor is

A conductor wire having ${10^{29}}$ free ${\rm{electrons}}\,\,/\,\,{{\rm{m}}^3}$ carries a current of ${\rm{20}}\,{\rm{A}}$. If the cross-section of the wire is $1\,\,{\rm{m}}{{\rm{m}}^2}$, then the drift velocity of electrons will be

How does the relaxation time of electrons in a conductor affect drift velocity?

A Copper wire of length ${\rm{1}}\,\,{\rm{m}}$ and radius ${\rm{1}}\,\,{\rm{mm}}$ is joined in series with an iron wire of length ${\rm{2}}\,\,{\rm{m}}$ and radius ${\rm{3}}\,\,{\rm{mm}}$ and a current is passed through the wires. The ratio of the current density in the wires. The ratio of the current density in the copper and iron wires is

An electron revolves $6\,\, imes \,\,{10^{15}}\,\,times/\sec$ in circular loop. The current in the loop is

At room temperature, copper has free electron density of $8.4\,\, imes \,\,{10^{28}}$ per ${m^3}$. The copper conductor has a cross-section of ${10^{ - 6}}\,{m^2}$ and carries a current of $5.4\,\,A$. The electron drift velocity in copper is

How many coulombs of electric charge must pass through acidulated water in order to release ${\rm{22}}{\rm{.4}}\,\,{\rm{L}}$ Of hydrogen at ${\rm{NTP}}$?

In a wire of circular cross-section with radius $r$, free electrons travel with a drift velocity $V$ when a current $I$ flows through the wire. What is the current in another wire of half the radius and of the same material when the drift velocity is $2\,\,V$