A point change of 0.25 muC ia located at r = 0, and uniform surface change densities are located as follows: 2mC/m^2 at r = 1 cm, and -0.6 mC/m^2 at r = 1.8cm. Calculate D at r = 0.5 cm; r = 2.5 cm. What uniform surface change density should be established at r = 3 cm to cause D = 0 at r = 3.5 cm

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