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**Unformatted text preview: **22.10: a) If 0 0 and uniform, then q inside any closed surface is greater than zero. E dA 0 and so the electric field cannot be uniform, i.e., since an arbitrary surface of our choice encloses a non-zero amount of charge, E must depend on position. b) However, inside a small bubble of zero density within the material with density , the field CAN be uniform. All that is important is that there be zero flux through the surface of the bubble (since it encloses no charge). (See Exercise 22.61.) ...

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