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A uniform rod is suspended horizontally ...

A uniform rod is suspended horizontally from its mid-point. A piece of metal whose weight is W is suspended at a distance l from the mid-point. Another weight `W_1` is suspended on the other side at a distance `l_1` from the mid-point to bring the rod to a horizontal position. When W is completely immersed in water, `W_1` needs to be kept at a distance `l_2` from the mid-point to get the rod back into horizontal position. The specific gravity of the metal piece is

A

`w/(w_1)`

B

`(wl_1)/(wl - w_1 l_2)`

C

`(l_1)/(l_1 - l_2)`

D

`(l_1)/(l_2)`

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