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 charges take to travel a distance $d$ ?
JEE MAIN 2018, Medium
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Charge density
$\rho=\frac{\text { charge }}{\text { volume }}=\frac{q}{A d} \Rightarrow q=\rho A d$
Also, $q=I T \Rightarrow T=\frac{q}{I}=\frac{\rho A d}{I}$
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