Discussion
The divergence of \( \mathbf{D} = 3x\mathbf{a}_x + 2y\mathbf{a}_y \) gives a charge density of
Answer: D
Differentiating each component with respect to its own coordinate and adding gives \( 3 + 2 = 5 \), a uniform density throughout the region. A z component would add a third term, and its absence simply means nothing depends on z.
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