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A uniform volume charge density of 80 uC/m is present throughout the
region 8 mm <r < 10 mm. Let p, = 0 for 0 <r < 8 mm. (a) Find the total
charge inside the spherical surface r = 10 mm. (b) Find D, at r = 10 mm.
(c) If there is no charge for r > 10 mm, find D, at r =
20 mm.

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