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Calculate the area of cross section of a wire if its length is 1.0 m, its resistance is 23 Ω and the resistivity of the material of the wire is 1.84 ×

10−6Ω m.


 Resistance R of a wire is given as:  \frac{Kl}{A} }   
Where, A is the area of cross-section of the wire l = Length of the wire = 1 m R = 23 Ω ρ = Resistivity of the wire = 1.84 × 10−6 Ωm Therefore, the area of cross-section of the wire is 8 ×10−8 m2.
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