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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 increase in the time period of the pendulum of increased length is?

A simple pendulum is executing simple harmonic motion with a time period T. If the length of the pendulum is increased by 21%, the increase in the time period of the pendulum of increased length is? Correct Answer 10%

As T is proportional to l, the percentage increase in a time period on increasing the length by 21% =1/2×∆l/l×100=1/2×21=10.5%.

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