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The length of a metal wire is l1 when the tension in it is T1 and is l2 when the tension is T2.

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The length of a metal wire is l1 when the tension in it is T1 and is l2 when the tension is T2. What is the natural length of wire?

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Let L be the original length and A the area of cross-section of wire.

The charge in length, when tension is T1 = ∆l1 = l1 - L

The charge inlength, when tension is T2 = ∆l2 = l2 - L
Young modulus in btoh case:

the original length and A the area

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