A $1\,m$ long copper wire carries a current of $1\,A$. If the cross section of the wire is $2.0\,mm ^{2}$ and the resistivity of copper is $1.7 \times 10^{-8}\,\Omega\,m$. the force experienced by moving electron in the wire is $\times 10^{-23}\,N$. (charge on electron $=1.6 \times 10^{-19}\,C$ )
JEE MAIN 2022, Medium
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$l=1\,m$
$i =1\,A$
Area $=2 \times 10^{-6}$
$\rho=1.7 \times 10^{-8}$
$R =\frac{\rho \ell}{ A }=\frac{1.7 \times 10^{-8} \times 1}{2 \times 10^{-5}}=\frac{1.7}{2} \times 10^{-2}$
$V =\frac{1.7}{2} \times 10^{-2}$
$F =1.6 \times 10^{-19} \times \frac{1.7}{2} \times 10^{-2}$
$=1.36 \times 10^{-21}$
$=136 \times 10^{-23}$
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