7. Define resistance and resistivity and also give the relation between them. Explain the dependence of resistance on temperature.
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Resistance is the measure of a material's ability to oppose the flow of electric current through it. It is denoted by R. ... Resistance of conductors increases with rise in temperaturewhile resistance of semiconductors and electrolytes decreases with rise intemperature
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resistance= it is the obstruction to flow of electrons by the free ions present in conductor and it is stated as ratio of the potential difference applied across the two ends of the conductor and current flowing through them, R=V/I
resistivity=it is the resistance of one one unit length and per unit area of cross section of wire p=R×l/A, where l is the length of the conductor
resistivity=it is the resistance of one one unit length and per unit area of cross section of wire p=R×l/A, where l is the length of the conductor
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