$A$ uniform cylinder of length $L$ and mass $M$ having cross-sectional area $A$ is suspended,with its length vertical,from a fixed point by a massless spring such that it is half submerged in a liquid of density $\sigma$ at equilibrium position. The extension $x_0$ of the spring when it is in equilibrium is:

  • A
    $\frac{Mg}{k}$
  • B
    $\frac{Mg}{k}\left( 1 - \frac{LA\sigma}{M} \right)$
  • C
    $\frac{Mg}{k}\left( 1 - \frac{LA\sigma}{2M} \right)$
  • D
    $\frac{Mg}{k}\left( 1 + \frac{LA\sigma}{M} \right)$

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