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## Homework Statement

[/B]

a) In a certain region of space, the volume charge density

*p*has a uniform positive value. Can

**E**be uniform in this region? Explain.

b) Suppose that in this region of uniform positive

*p*there is a "bubble" within which

*p*=0. Can

**E**be uniform within this bubble? Explain.

## Homework Equations

**E**= electric field

Gauss's law: Flux= ∫

**E**d

**A**= Q/ε

_{0}

## The Attempt at a Solution

I thought that if the volume charge density

*p*were uniform,

**E**would also be uniform because the charge enclosed by a Gaussian surface would be the same everywhere. However my book says that in a region where "the electric field

**E**is uniform... the volume charge density

*p*must be 0."