The length of a metallic wire is \(l_1,\) when the tension in it is \(T_1\) and is \(l_2\) when the tension is \(T_2.\) The original (natural) length of the wire is:
1. \(\dfrac{l_1+l_2}{2}\) 2. \(\dfrac{T_2l_1+T_1l_2}{T_1+T_2}\)
3. \(\dfrac{T_2l_1-T_1l_2}{T_2-T_1}\) 4. \(\dfrac{T_1l_1-T_2l_2}{T_2-T_1}\)
Subtopic:  Hooke's Law |
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