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Q.

The resistance of a 10m long wire is 10 Ω.  Its length is increased by 25% by stretching the wire uniformly.  The resistance of wire will change to 

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a

12.5Ω

b

15.6Ω

c

16.6Ω

d

14.5Ω

answer is C.

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Detailed Solution

R2R1=l2l12

R210=12.5102

R2=15.625Ω

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