The length of a simple pendulum executing simple harmonic motion is...

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The length of a simple pendulum executing simple harmonic motion is increased by \( 21 \% \). The percentage increase in the time period of the pendulum of increased length is
(a) \( 11 \% \)
(b) \( 21 \% \)
(c) \( 42 \% \)
(d) \( 10 \% \)
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