A negligibly small current is passeed through a wire of length 15cm and uniform cross-section `6.0xx10^-7m^2`,and its resistance is measured to be `5.0Omega`. What is the resistivity of the material at the temperature of the experiment?

A steel wire of length 4.7m and cross sectional area 2xx10^-5m^2 stretches by the same amount as a copper wire of length 3.5m and cross sectional area of 4xx10^-5m^2 under a given load. What is the ratio of the Young's modulus of steel to that of copper?