Question

53. 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
becomes 42.4 cm when the wire is stretched so that
its length increases by
1) 10 % 2) 20 % 3) 25 % 4) 42.7 %
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Answer 1

Answer:

Hence the option is 4)42.7%