what is restivity. write it's expression
Answers
Answer:
Resistivity is the measure of a material's ability to oppose the flow of current . Resistivity of a conductor is a property of the material of the conductor. Unit of resistivity is Ohm meter, Ω m . Resistivity of the material of the conductor changes with
It apose the current
Explanation:
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Resistivity is the measure of a material's ability to oppose the flow of current . Resistivity of a conductor is a property of the material of the conductor. Unit of resistivity is Ohm meter, Ω m . Resistivity of the material of the conductor changes with temperature.
expression
conductor of length (L) and area (A). ? = AR / L (b) The SI unit of electrical resistivity is the ohm?metre (??m). ( c) Resistivity is the obstruction offered to the flow of current by UNIT AREA OF the conductor. So basically, resistance is the property of the object (say a copper wire), whereas resistivity is the property of the substance (copper). And so resistance depends upon the properties of the object. Whereas resistivity depends upon the properties of the metal. (d)RESISTIVITY (rho = RA/l where R=Resistance;A = area of cross section; l = length) depends on temperature and nature of material using which the wire is made. RESISTIVITY dosent depend on length and area of cross section of the wire.