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Question

A steel wire is suspended vertically from a rigid support. When loaded with a weight in air, it expands by La and when the weight is immersed completely in water, the extension is reduced to Lw. Then relative density of the material of the weight is

A
LaLw
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B
LwLa
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C
LwLaLw
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D
LaLaLw
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Solution

The correct option is D LaLaLw
La=VρgALy
LW=V(ρσ)gALy

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