A particle of mass m is attached to a me...

A particle of mass m is attached to a metallic wire of length l, area of cross-section A and Young's modulus of elasticity Y . If the extension in the wire at an instant the string becomes vertical after the particle is released and moves in a verticle circle is `(nmgl)/(AY)`. Find the value of n.

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The correct Answer is:

3

When string is vertical
`T - mg = (mv^2)/l implies T = 3mg`

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