If a wire is stretched to make it 
longer then its resistance will
A
Increase by 
B
Increase by 
C
Decrease by 
D
Decrease by 
Text Solution
Verified by ExpertsThe correct answer is:
B
Volume V of the wire is,
By differentiation, 
…(i)
Differentiating, 
…(ii)
By putting value of 
in equation (ii), we get
Dividing both sides by R and putting 
in RHS.
So, 
Hence, 
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