QAIPM-2002-Ph-2842: NEET 2002 Physics - Class 12 AIPM-2002-Ph-2842 Solution: Specific resistance of a conductor increases with

Resistance of a conductor is given by R = _ l A , where _ is the specific resistance, l is the length and A is the cross-sectional area of the conductor. Now, when l = 1 and A = 1, R = _ . So specific resistance or resistivity of a material may be defined as the resistance of a specimen of the material having unit length and unit cross-section. Hence, specific resistance is a property of a material and it will increase with the increase of temperature, but will not vary with the dimensions (length, crosssection) of the conductor.