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In a region exhibiting spherical symmetry, the electric flux density is found to be D, =
(Por/3)â, (0 <r < a), D2 = 0 (a < r < b), and D3 = [(a³p.)/(3r²)]â, (r > b), where
%3D
Po is a constant.
(a) Find the charge configuration that would produce the given field.
(b) What total charge is present?

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