Natural length of a spring or wire from its lengths l1 and l2 under tensions T1 and T2 (general formula)

1. A.
   $\frac{T_{2}l_{2} + T_{1}l_{1}}{T_{2} + T_{1}}$
2. B.
   $\frac{T_{2}l_{2} - T_{1}l_{1}}{T_{2} - T_{1}}$
3. C.
   $\frac{T_{2}l_{1} + T_{1}l_{2}}{T_{2} + T_{1}}$
4. D.
   $\frac{T_{2}l_{1} - T_{1}l_{2}}{T_{2} - T_{1}}$

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1. A.
   $\frac{l_{1} + l_{2}}{2}$
2. B.
   $\frac{T_{1}l_{1} - T_{2}l_{2}}{{\text{ }T}_{2} - T_{1}}$
3. C.
   $\frac{T_{2}l_{1} + T_{1}l_{2}}{{\text{ }T}_{1} + T_{2}}$
4. D.
   $\frac{T_{2}l_{1} - T_{1}l_{2}}{{\text{ }T}_{2} - T_{1}}$

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