Physics · 2018
JEE Main · 15 April 2018, Shift 2 · Q16
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 ρ, how…
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 $\displaystyle \rho$, how long will the charges take to travel a distance d ?
Official answer
(3)
$\displaystyle \frac{\rho \mathrm{d} \mathrm{~A}}{\mathrm{I}}$
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JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.