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Two large flat parallel sheets have opposite uniform surface
charge densities ±o and are separated a distance d. A large,
uncharged conducting slab of thickness d/3 is parallel to the
charged sheets, centered between them. Find the electrostatic
potential as a function of distance y perpendicular to the
sheets. Take the reference potential V, = 0 and the origin y =
0 to be at the negative sheet.

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