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CBSE Class 10 Answered

What is the exact definition of Resistivity of a material?What are the probable questions which could come in exam about this topic ?
Asked by Udit Lilhare | 02 May, 2013, 11:54: AM
answered-by-expert Expert 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, ? m . Resistivity of the material of the conductor changes with temperature.

Resistivity of copper is 1.7 × 10 -8 ? m at room temperature. There is nothing called resistivity of a circuit.

Following is the equation relating resistivity (?) and resistance (R) of a conductor of length (L) and area (A).

Answered by | 02 May, 2013, 12:17: PM

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