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In a vertical U-tube containing a luquid...

In a vertical `U`-tube containing a luquid, the two arms are maintained at different temperatures, `t_(1)` and `t_(2)` . The liquid coplumns in the two arms have heights `l_(1)` and `l_(2)` respectively. The coefficient of volume expansion of the liquid is equal to

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The correct Answer is:
`(l_(1)-l_(2))/(l_(1)(T_(2)-T_(1)))`
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