Physics · 2021
JEE Main · 17 March 2021, Shift 1 · Q5
A current of 10 A exists in a wire of crosssectional area of 5 mm^2 with a drift velocity of 2 × 10^-3 ms^-1. The number of free electrons in each…
A current of $\displaystyle 10$ A exists in a wire of crosssectional area of $\displaystyle 5 \mathrm{~mm}^2$ with a drift velocity of $\displaystyle 2 \times 10^{-3} \mathrm{~ms}^{-1}$. The number of free electrons in each cubic meter of the wire is \_\_\_\_.
Official answer
(3)
$\displaystyle 625 \times 10^{25}$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.