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 ..... $\%$
  • A$10$
  • B$21$
  • C$30$
  • D$50$
AIEEE 2003,AIIMS 2001, Medium
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