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NCERT Class XII Chapter
Current Electricity
Questions With Solutions

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Question : 6
Total: 24
A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 × 10–7m2, and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?
Solution:  
We know the relation, R = ρ
l
A
 ⇒ 5 = ρ
15
6×10−7
∴ Resistivity , ρ =
30×10−7
15
 = 2 × 10−7 Ω m
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