Two copper wires of equal length but different cross-sectional areas carry the same current. Which of the following statements is true regarding the drift velocities of electrons in the two wires?

When a current flows through a conductor its temperature

The speed at which the current travels, in a conductor, is nearly

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

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.

A current of $5A$ passes through a copper conductor (resistivity $= 1.7 imes {10^{ - 8}}\Omega m$) of radius of cross section 5mm. Find the mobility of the charges if their drift velocity is $1.1 imes {10^{ - 3}}\,m/s$

A potential difference of $V$ is applied at the ends of a copper wire of length $l$ and diameter $d$. On doubling only $d$, the drift velocity,

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

The number of free electrons per ${\rm{100}}\,\,{\rm{mm}}$ of ordinary copper wire is $2\,\, imes \,\,{10^{21}}$. Average drift speed of electrons is $0.25\,\,{\rm{m}}{{\rm{s}}^{ - 1}}$. The current flowing is

${\rm{160}}\,\,{\rm{W - }}\,{\rm{60}}\,\,{\rm{V}}$ lamp is connected at ${\rm{60}}{\mkern 1mu} {\rm{V}}\,\,\,{\rm{DC}}$ supply. The number of electrons passing through the lamp in ${\rm{1}}\,\,{\rm{min}}$ is (the charge of electron $e = 1.6\,\, imes \,\,{10^{ - 19}}\,\,{\rm{C}}$

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 $2\,\,V$