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Q.

In order to quadruple the resistance of a uniform wire, a part of its length was uniformly stretched till the final length of the entire wire was 1.5 times the original length, the part of the wire was fraction equal to

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a

1/8

b

1/6

c

1/10

d

1/4

answer is A.

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Detailed Solution

Let l be the original length of wire and x be its length stretched uniformly such that final length is 1.5 l
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