2. A sphere with radius a contains a uniform volume charge density ofρ_vin the region: 0 ＜ r ＜ a. If the sphere is isolated by a conducting spherical shell with inner radius b and outer radius c placed concentrically, as shown in figure. What is the electric field intensity in the region b ＜ r ＜ c?
(A)
(B)
(C)
(D)

(E)None of the above

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