If a copper wire is stretched to make it 0.1% longer, then the percentage change in resistance is approximately -
Text Solution
Verified by ExpertsThe correct answer is:
B
R = 
, m = A λ d
∴ R = 
∴ R ∝ λ 2 ∴ 
× 100 = 2 
× 100 = 2 × 0.1 = 0.2%
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