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Q.

If a wire is stretched, so that its length is 20% more than its initial length, the percentage increase in the resistance of the wire is :-

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a

25%

b

40%

c

44%

d

10%

answer is C.

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Detailed Solution

l1=100
L2=120
R1R2=l1l22R1−R2R2×100

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If a wire is stretched, so that its length is 20% more than its initial length, the percentage increase in the resistance of the wire is :-