Find the loss in gravitational potential...

Find the loss in gravitational potential energy of cylinder when value is opened and level of liquid in both cylinder becomes same

`rho A g ((x_1 - x_2)^2)/4`

`rho A g ((x_1 + x_2)^2)/4`

`rho A g ((x_1)^2 -( x_2)^2)/4`

`rho A g ((x_1)^2 + ( x_2)^2)/4`

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