NCERT Question 18 (d) - Chapter 12 Class 10 - Electricity

Last updated at August 4, 2026 by

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How does the resistance of a wire vary with its area of cross-section?

Answer

 

We know that

R =  ρ l/A

Where

R = Resistance, 

ρ = Resistivity of the material

L = length of the wire

A = Area of cross-section of the wire

 

Hence, resistance is inversely proportional to the area of cross-section

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