PhysicsMedium226×since 2002Q6396A copper rod of cross-sectional area A carries a uniform current I through it. At temperature T, if the volume charge density of the rod is ρ\rhoρ, how long will the changes take to travel a distance d ?A2ρ d AI{{2\rho \,d\,A} \over {\rm I}}I2ρdAB2ρ d AI T{{2\rho \,d\,A} \over {{\rm I}\,T}}IT2ρdACρ d AI {{\rho \,d\,A} \over {{\rm I}\,}}IρdADρ d AI T{{\rho \,d\,A} \over {{\rm I}\,T}}ITρdACheck answerSkip