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Find the electrostatic potential inside a tube of
infinite length along the axis z and whose cross
section is a square of side a in the xy plane; as
shown in figure, three of sides are grounded to
zero, while the top face, at y = a, has a constant
potential Vo-
y, V(x.y=a)=V,
V(x=0,y)=0
V(x=a,y)=0
V(x,y=0)=0

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