A disc of mass $m$ and radius $R$ is attached to celling with the help of ropes of length $l$. Find the time period of small oscillation of disc in the plane of disc.
  • A$2\pi \sqrt {\frac{{l + \frac{R}{2}}}{g}} $
  • B$2\pi \sqrt {\frac{{l^2 + (\frac{R}{2})^2}}{g(\frac{R}{2}+ l)}} $
  • C$2\pi \sqrt {\frac{l}{g}} $
  • D
    none of these
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