23. The electric flux density D = 10r³a, C/m² in the region 0≤r<1 m. (a) Find p, at r = 0.4 m. (b) Find D, at r = 0.4 m. (c) What total charge is contained in the region 0≤r≤0.4 1? (d) If p, = 0 for r> 1 m, find D, for r> 1 m.
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