A 1 m long copper wire carries a current of 1 A. If the cross section of the wire is 2.0mm2 and the resistivity of copper is 1.7 * 10-8 Ω m , the force experienced by moving electron in the wire is _______* 10-23N.

i = 1 A j=σE A = 2mm2 ρ=1.7*10−8Ωm F=eE=ejσ=eiAσ=eiρA = 1.6*10−19*1.7*10−82*10−6 = 136 * 10-23 N

A 1 m long copper wire carries a current of 1 A. If the cross section of the wire is 2.0mm² and the resistivity of copper is 1.7 * 10^-8 $Ω m,$ the force experienced by moving electron in the wire is _______* 10^-23N.

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Payal Gupta | Contributor-Level 10

6 months ago

i = 1 A $j = σ E$

A = 2mm²

$ρ = 1.7 * 1 0^{- 8} Ω m$ $F = e E = \frac{e j}{σ} = \frac{e i}{A σ} = \frac{e i ρ}{A}$

= $\frac{1.6 * 1 0^{- 19} * 1.7 * 1 0^{- 8}}{2 * 1 0^{- 6}}$

= 136 * 10^-23 N

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