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1. For the manometer set up shown in the figure, the pressure difference PA - PB is given by
(A): (ρH - ρair)gH
(B): (ρH - ρL)gH
(C): (ρH - ρL) gH + (ρL - ρair) . g(L - H)
(D): (ρH - ρL) gL + (ρL - ρair)gH
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