the resistance of a conductor of lenght 'x' is 'r'. If its area of cross- section is 'a', what is its resistivity? What is its unit?
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Answer: resistivity = r a/x
Unit of resistivity is rho ‘ρ’
Explanation:
Resistance = resistivity length of conductor/ area of cross-section
r = ρ x/a
[transposing the equation]
r a/x = ρ
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