When the tension on wire is 4 units, its length is l1 and when the tension is 5 units, its length is l2 . Its natural length is

Q: When the tension on wire is 4 units, its length is l1 and when the tension is 5 units, its length is l2 . Its natural length is

(a) 4l1 – 3l2

(b) 5 l1 – 4l2

(c) 5l2 – 4 l1

(d) (l1 + l2)/2

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Ans: (b)