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← JEE Main 2022 · 27 Jul · Shift 1
PhysicsInteger+4 / -1Question 55 of 90

JEE Main 2022 · 27 Jul · Shift 1, Physics question 55

A 1 m long copper wire carries a current of 1 A. If the cross section of the wire is 2.0 mm2^2 and the resistivity of copper is 1.7×10−81.7\times10^{-8} Ωm, the force experienced by moving electron in the wire is ______ ×10−23\times10^{-23} N.

(charge on electron = 1.6×10−191.6\times10^{-19} C)

Answer and worked solution

Official answer: 136

Field in the wire E=ρJ=1.7×10−8×12×10−6=8.5×10−3E=\rho J=1.7\times10^{-8}\times\frac1{2\times10^{-6}}=8.5\times10^{-3} V m−1^{-1}.

Force eE=1.36×10−21=136×10−23eE=1.36\times10^{-21}=136\times10^{-23} N.

Answer: 136

Topics:Drift velocity and currentOhm's law and resistivity
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