Question

18. A wire of length 6 m is stretched such that its radius is reduced by 20%. Which one of the following is the value of increase in its length ?solve this question and give the answer?
(a) 50%
(b) 56.25%
(C) 62.25%
(d) 75%​

Answer 1

Answer:

62.25

Step-by-step explanation:

62.25 is correct

Answer 2

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A wire us stretched increase to length by 5% consider to initial length is l and cross sectional area is A

∴ volume V=Al

Now length is increased by 5%

∴ New length =

If new area is l considering that the volume of the wire is unchanged