Three surfaces of liquid are shown here. Find | vedclass

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(B) For a liquid surface to be in equilibrium,the net force on a molecule at the surface must be perpendicular to the surface.In case $A$,the surface

Vedclass · Accepted Answer

In case of liquid $B$,the resultant force on a molecule on the surface would be downward,and the surface is concave.

Vedclass · Answer

(B) For a liquid surface to be in equilibrium,the net force on a molecule at the surface must be perpendicular to the surface.In case $A$,the surface is flat. The net force on a molecule at the surface is directed vertically downwards,which is perpendicular to the flat surface. This is a stable equilibrium.In case $B$,the surface is concave. The resultant force on a molecule at the surface is directed downwards,which is perpendicular to the concave surface. This occurs when the adhesive force between liquid and container is greater than the cohesive force between liquid molecules.In case $C$,the surface is convex. The resultant force on a molecule at the surface is directed downwards,which is perpendicular to the convex surface. This occurs when the cohesive force is greater than the adhesive force.Therefore,statement $B$ is correct because for a concave surface,the resultant force on a surface molecule is directed into the liquid (downwards).

Three surfaces of liquid are shown here. Find the correct statements.

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