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5. Given the surface charge density ps = 100 µC/m², existing in the region p < 0.2 m,
= 0, find E at (a) PA (p = 0, z = 0.5); (b) PB (p = 0, z = -0.5). Show that (c) the
field along the z axis reduces to that of an infinite sheet charge at small values of
z; (d) the z axis field reduces to that of a point charge at large values of z.

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