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प्रश्न
The resistance of a conductor of length x is r. If its area of cross-section is a, what is its resistivity? What is its unit?
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उत्तर
Resistivity of a conductor, `ρ = (RA)/L`
Here, L = x, R = r and A = a
`therefore ρ = (ra)/x`
The unit of resistivity is ohm-metre (Ω m).
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