A simple pendulum is executing simple harmonic motion with a time p...

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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
\( \mathrm{P} \)
[RPET 2000, 01; MH CET 2004; UPSEAT 2005]
(a) \( 10 \% \)
(b) \( 21 \% \)
(c) \( 30 \% \)
(d) \( 50 \% \)
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