A simple pendulum is executing simple harmonic motion with a time period $T$. If the length of the pendulum is increased by $21\%$, the percentage increase in the time period of the pendulum of increased length is ..... $\%$

  • [AIEEE 2003]
  • [AIIMS 2001]
  • A

    $10$

  • B

    $21$

  • C

    $30$

  • D

    $50$

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