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A mass 'm' kg is whirled in a verticle ...

A mass `'m' kg` is whirled in a verticle plane by tying it at the end of a flexible wire of length `'L'` and area of cross-section `'A'` such that it just completes the verticle circle. When the mass is a its lowest positon, the strain produced in the wire is (Young's modulus of the wire is `'Y'`)

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