→X + + + + + + -d 0 +J+d + + + + A flat slab of nonconducting material has thickness 2d, which is small compared to its height and breadth. As shown in the figure, the x axis is defined to be along the direction of the slab’s thickness with the origin at the center of the slab. This slab region in the charge density p(x) =-Po carries volume a -d
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