Question $2(10)$ The setup below shows $3$ different fluids: A$,$ B and air, in a U$-$tube like configuration with the

end open to the atmosphere. The gauge pressure at Point $A$ is $-10.$kPa.

a$.$ Identify $2$ locations where the pressures are equal. $(2)$

b$.$ What is the height of the column of air? How much pressure does the column of air exert on the

Fluid A and what does that imply with respect to a force balance? $(2)$

c$.$ What is the $SG$ of Liquid $B?(6)$