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D3.2. Calculate D in rectangular coordinates at point P(2, -3, 6) produced by: (a) a point charge QA-55 mC at Q(-2, 3, -6); (b a uniform line charge ?ρLB 20 mC/m on the x axis; (c) a uniform surface charge density ρsc 120 μC/ m" on the plane z =-5 m.