A negligibly small current is passed through a wire of length 15 m and unifrom cross-section `6.0 xx 10^(-7) m^(2)` and its resistance is measured to be `5 Omega`. What is the resistivity of the material at the temperature of the experiment?

A wire of length 1 m and radius 0.1 mn has a resistance of 100Omega . Find the resistivity of the material.

A metal wire of length 2.5m and area of cross-section 1.5xx10^(-6)m^(2) is stretched through 2mm. If its Young's modulus is 1.25xx10^(11)Nm^(-2), find the tension in the wire.

A steet wire of length 4.7 m and cross - sectional area 3.0xx10^(-5)m^(2) stretches by the same amount as a copper wire of length 3.5 m and cross- sectional area of 4.0xx10^(-5)m^(2) under a given load. What is the ratio of the Young's modulus of steel to that of copper ?

Resistance of a metal wire of length 1 m is 26 Omega at 20^@ C. If the diameter of the wire is 0.3 mm, what will be the resistivity of the metal at that temperature? Using Table 12.2, predict the material of the wire.