Resisitance: ……… : : Resistivity : `Omegam`.

Write formula: Resistivity

Calculate the length of a wire of diameter 1 mm needed to prepare a coil of resistance 25 ohm. The resistivity of the material of the wire is 3.14 times 10^(-7) Omega.m .

A wire has length 10 m and resistance 20 Omega If the resistivity of the material of the wire is 6 times 10^(-7) Omega.m , find the area of cross section of the wire.

What is the unit of resistivity.

Complete the sentences :The unit of resistivity is…… .

Define specific resistance (resistivity). State its unit and dimension.

The resistance of a copper wire is 20 Omega at 0^@C . Find the resistance at 60^@C if the temperature coefficient of resistance of material is 0.004//^@C .

The resistance of a tungsten wire is 1000 Omega at 0^@C and 1045 Omega at 10^@C . Calculate the temperature coefficient of resistance of tungsten.

A 6m long wire has diameter 0.5 mm. Its resistance is 50 Omega . Find the resistivity and conductivity.