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The length of a simple pendulum is decre...

The length of a simple pendulum is decreased by `21%`. Find the percentage change in its time period.

Text Solution

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The correct Answer is:
A
`T prop sqrt (l)`
`(T')/(T) = sqrt((l')/(l)) = sqrt((1.21l)/(l)) = 1.1`
`:. T' = 1.1T`
Hence, percentage increase in `T` is `11%`
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