question_answer

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                                                                      [AIEEE 2003]

A)  \[11%\]            

B)       \[21%\]

C)  \[42%\]

D)       \[10.5%\]

Correct Answer: D

Solution :

[d] The time period of simple pendulum is given by

(differentiating)

Given,    21%