A sphere of diameter $r$ is cut from a sphere of radius $r$ such that the centre of mass of the remaining mass be at maximum distance from original centre; then the distance is
A sphere of diameter $r$ is cut from a sphere of radius $r$ such that the centre of mass of the remaining mass be at maximum distance from original centre; then the distance is
- A
$\frac {r}{2}$
- B
$\frac {r}{3}$
- C
$\frac {r}{6}$
- D
none of these
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