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The length of a metal wire is $l_1$, when the tension in it is $T_1$ and is $l_2$ when the tension is $T_2$. The unstretched length of the wire is
  • A$\sqrt {{l_1}{l_2}} $
  • B$\frac{{{l_1} + {l_2}}}{2}$
  • C$\frac{{{l_1}{T_2} - {l_2}{T_1}}}{{{T_2} - {T_1}}}$
  • D$\frac{{{l_1}{T_2} + {l_2}{T_1}}}{{{T_2} + {T_1}}}$
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