Question: Spherical surfaces at r = 2, 4, and 6 m carry uniform surface charge densities of 20 nC/m 2 , 4 nC/m 2 , and

Spherical surfaces at r = 2, 4, and 6 m carry uniform surface charge densities of 20 nC/m2, −4 nC/m2, and ρS0, respectively.

(a) Find D at r = 1, 3, and 5 m.

(b) Determine ρS0 such that D = 0 at r = 7 m.

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