The length of metallic wire is l1 when tension in it is T1. It is l2 when the tension is T2. The original length of the wire will be :

Question

The length of metallic wire is l₁ when tension in it is T₁. It is l₂ when the tension is T₂. The original length of the wire will be :

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

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

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

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

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