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Physics · 2015
JEE Main 2015 · 2015-04-04 Offline · Q17
When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is 2.5 × 10^-4 ms^-1. If the electron density in…
When 5V potential difference is applied across a wire of length $\displaystyle 0.1$ m, the drift speed of electrons is $\displaystyle 2.5 \times 10^{-4} \mathrm{~ms}^{-1}$. If the electron density in the wire is $\displaystyle 8 \times 10^{28} \mathrm{~m}^{-3}$, the resistivity of the material is close to :
Official answer
(4)
$\displaystyle 1.6 \times 10^{-5} \Omega \mathrm{~m}$
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JEE Main 2015 Physics question, with the answer from NTA’s final answer key. Where our answers come from.