Current Electricity

JEE Main level, single correct, medium

78 of 380

Question 78 of 380

Consider four conducing materials copper, tungsten, mercury and aluminum with resistivity ρC,ρT,ρM{\rho }_{C},{\rho }_{T},{\rho }_{M} and ρA{\rho }_{A} respectively. Then :

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Answer: (B) ρM>ρA>ρC{\rho }_{M}\gt {\rho }_{A}\gt {\rho }_{C}

ρM=98×10−8Ωm\begin{matrix}{\rho }_{M}=98\times {10}^{-8}\end{matrix}\Omega m
ρA=2.65×10−8Ωm\begin{matrix}{\rho }_{A}=2.65\times {10}^{-8}\end{matrix}\Omega m
ρC=1.724×10−8Ωm{\rho }_{C}=1.724\times {10}^{-8}\Omega m
ρT=5.65×10−8Ωm{\rho }_{T}=5.65\times {10}^{-8}\Omega m

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