If a copper wire is stretched to make it 0.1% longer, what is the percentage change in its resistance?
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(0.2 %)
Sol. Resistance R = 
By partial differentiation
= 
– 
.........(i)
ρ = Constant
Volume of wire remains constant
A × λ = Constant
By partial differentiation
+ 
= 0.........(ii)
By equation (i) and (ii)
We get 
= 2 
(% change in R) = 2 (% change in length)
= 0.2 %
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