A 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 $\rho $, how long will the changes take to travel a distance d ?
${{2\rho \,d\,A} \over {\rm I}}$
${{2\rho \,d\,A} \over {{\rm I}\,T}}$
${{\rho \,d\,A} \over {{\rm I}\,}}$
${{\rho \,d\,A} \over {{\rm I}\,T}}$
Solution
Please login to view the detailed solution steps...
