Consider a mercury-filled tube as shown in the figure below
Which of the following options about the pressures at the lettered locations $(A, B, C, D)$ is true?
KVPY 2021, Diffcult
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(B)
$\Delta p =\rho g \Delta h$
$B, C, D$ are at
same level, so
their $\Delta h =0$
$\Rightarrow \Delta p =0$
$\Rightarrow$ same pressure
but, $A$ is above them
so its pressurew is less
$P_B = P_C = P_D > P_A$
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