1.

AU-tube is partly filled with a liquid A. Another liquid B, which does not mix with A, is poured into one side until it stands a height h above the level of A on the other side, which has mean while risen a heigh l. The density of B relative to that of A is :

Answer»

`l/(h+l)`
`l/(h+2L)`
`(2l)/(h+2l)`
`l/(h+2l)`

SOLUTION :POINTS `C_(1)` and `C_(2)` are at the same pressure. Therefore, the pressure drop from `C_(1)` to `D_(1)` is the same as that from `C_(2)` to `D_(2)` both `D_(1)` and `D_(2)` being at atmospheric pressure.

Let `p_(a)` and `p_(b)` be the densities of A and B, respectively.
We then have (h+2l)`p_(b)g=2lp_(a)g` or `(p_(b))/(p_(a))=(2l)/(h+2l)`
CORRECT choice is (c).


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