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Question

When the tension in a metal wire is T1 its length is l1, when the tension is T2 its length is l2. The natural length of wire is :

A
T1l1+T2l2
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B
l1T2l2T1T2T1
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C
l1T2l2T1T2+T1
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D
T2T1(l1+l2)
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