The metallic bob of a simple pendulum has the relative density $\rho$. The time period of this pendulum is $T$. If the metallic bob is immersed in water, then the new time period is given by
  • A$T\frac{{\rho - 1}}{\rho }$
  • B$T\frac{\rho }{{\rho - 1}}$
  • C$T\sqrt {\frac{{\rho - 1}}{\rho }} $
  • D$T\sqrt {\frac{\rho }{{\rho - 1}}} $
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