$A$ small spherical ball of radius '$r$' is rolling on a curved surface which is frictionless and has a radius of curvature '$R$'. Its motion is simple harmonic. Then its time period of oscillation is proportional to ($g=$ acceleration due to gravity).

  • A
    $\sqrt{\frac{R}{g}}$
  • B
    $\sqrt{\frac{r}{g}}$
  • C
    $\sqrt{\frac{R-r}{g}}$
  • D
    $\sqrt{\frac{R+r}{g}}$

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