Prove the relationship between Resistance and resistivity.

Resistance of a metal wire is found to be DIRECTLY PROPOTIONAL TO IT'S LENGTH.

and INVERSELY PROPOTIONAL TO THE CROSS SECTIONAL AREA.

Hence,

R  L/A, where R is the resistance, L is the length, and A is the cross sectional area.

The propotionality constant is called resistivity, and denoted by ρ.

R = ρL/A.

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