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

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 ?

Calculate the resistance of a metal wire of length 2 m and area of cross section 1·55 xx 10^(-6) m^(2) , if the resistivity of the metal be 2·8 xx 10^(-8) Omega m ?

A current of 5 A is passing through a metallic wire of cross- sectional area 4 xx 10^(-6) m^(2) . If the density of charge carries of the wire is 5 xx 10^(26) m^(-3) , the drift velocity of the electrons will be

The resistivity of manganese wire of length 1 m is 1.84xx10^-6Omegam" at "20^(@)C . If the diameter of the wire is 3xx10^-4m , what will be the resistance of the wire at that temperature?

100 mg mass of nichrome metal is drawn into a wire of area of cross-section 0.05 mm. Calculate the resistance of this wire. Given density of nichrome 8.4 xx 10^3 "kgm"^(-3) and resistivity of the material as 1.2 xx 10^(-6) Omega m.