A simple pendulum of length $ l$ has a brass bob attached at its lower end. Its period is $T$. If a steel bob of same size, having density $ x$ times that of brass, replaces the brass bob and its length is changed so that period becomes $2T$, then new length is
  • A$2 l$
  • B$4 l$
  • C$4 l x$
  • D$\frac{{4l}}{x}$
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