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Q.

When a conducting wire is connected in the right gap and known resistance in the left gap, the balancing length is 60cm. The balancing length becoms 42.4 cm when the wire is stretched so that its length increases by

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a

10%

b

20%

c

25%

d

42.7%

answer is D.

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Detailed Solution

XR=6040;XR'=42.457.6;R'R=6040×57.642.4Rαl2l1−lI×100=R1−RR×100
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