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A load of 20 kg is suspended by a steel ...

A load of 20 kg is suspended by a steel wire in a sonometer experiment velocity of waves when the wire is rubbed with a resined cloth along the length is 20 times the velocity of waves in the same string when its plucked. Find area of cross- section of the wire,if Y for steel is `19.6xx10^(10) Nm^(-2)` and ` g=9.8 ms^(-2)`.

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