The length of wire, when $M_1$ is hung from it, is $I_1$ and is $I_2$ with both $M_1$ and $M_2$ hanging. The natural length of wire is ........
The length of wire, when $M_1$ is hung from it, is $I_1$ and is $I_2$ with both $M_1$ and $M_2$ hanging. The natural length of wire is ........
- A
$\frac{M_1}{M_2}\left(l_1-l_2\right)+l_1$
- B
$\frac{M_2 l_1-M_1 l_2}{M_1+M_2}$
- C
$\frac{l_1+l_2}{2}$
- D
$\sqrt{l_1 l_2}$
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