Physics · 2022
NEET 2022 · 17 July · Code R6 · Q17
A copper wire of length 10 m and radius (10^-2 / √ π ) m has electrical resistance of 10 Ω. The current density in the wire for an electric field…
A copper wire of length $\displaystyle 10$ m and radius $\displaystyle \left(10^{-2} / \sqrt{\pi}\right) \mathrm{m}$ has electrical resistance of $\displaystyle 10 \Omega$. The current density in the wire for an electric field strength of $\displaystyle 10(\mathrm{~V} / \mathrm{m})$ is :
Official answer
From NTA’s final answer key for this paper.
(1)
$\displaystyle 10^5 \mathrm{~A} / \mathrm{m}^2$
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NEET (UG) 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.