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

Question

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

$\sqrt {{l_1}{l_2}} $

${{{l_1}{T_2} - {l_2}{T_1}} \over {{T_2} - {T_1}}}$

${{{l_1}{T_2} + {l_2}{T_1}} \over {{T_2} + {T_1}}}$

${{{l_1} + {l_2}} \over 2}$

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