Which of these is true for an impermeable wall? – McqOptions

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1.	Which of these is true for an impermeable wall?
A.	( vec{V}=0 ) above the surface
B.	( vec{V}=0 ) at the surface
C.	( vec{V}. vec{n}=0 ) at the surface
D.	( vec{V}. vec{n}=0 ) above the surface
Answer» D. ( vec{V}. vec{n}=0 ) above the surface

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