A negligible small current is pass through a wire of length 15m and uniform cross section `6xx10^(-7)m^(2)` and its resistance is measured to be `5Omega`. What is the resistivity of the material at the temperature of the experiment ?

Explanation

R=5`Omega`l=15m,A=`6xx10^(-7)m^(2)`
`p=(RA)/(l)=(5xx6xx10^(-7))/(15)=2xx10^(-7)Omegam`