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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

A

`(l_(1)-l_(2))/(l_(2)t_(1)-l_(1)t_(2))`

B

`(l_(1)-l_(2))/(l_(1)t_(1)-l_(2)t_(2))`

C

`(l_(1)+l_(2))/(l_(2)t_(1)+l_(1)t_(2))`

D

`(l_(1)+l_(2))/(l_(1)t_(1)+l_(2)t_(2))`

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