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JEE Main 2015 Physics question

PhysicsOscillationsJEE Main 2015

A pendulum made of a uniform wire of cross sectional area A has time period T. When an additional mass M is added to its bob, the time period changes to . If the Young's modulus of the material of the wire is Y, then is equal to: (g = gravitational acceleration)

Answer: (2)

Solution

Adding M increases the tension by Mg, stretching the wire by . Since ,

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Question ID VK-115141