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The figure below shows a spherical shell with uniform volume charge density ρ = 1.92 nC/m3, inner radius a = 12.0 cm, and outer radius b = 2.60a.
What is the magnitude of the electric field at the following radial distances?
(e) r = b
____________N/C
(f) r = 3.00b
____________N/C
(do I just plug in b into the r from the earlier part of this question or do I use the derivation equation from part D?)
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