Aheavy brass sphere is hung from a light spring and is set in vertical small oscillation with a period $T.$ The sphere is now immersed in a non-viscous liquid with a density $1/10\,th$ the density of the sphere. If the system is now set in vertical $S.H.M.,$ its period will be
  • A$(9/10)T$
  • B$(9/10)^2T$
  • C$(10/9)\, T$
  • D$T$
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