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JEE Main 2003 Physics question

PhysicsOscillationsJEE Main 2003

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

Answer: (4)

Solution

, so . New length gives , an exact increase of 10%, option (4). The approximate rule

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Question ID VK-038061