Discussion
In Cartesian coordinates the divergence of \( \mathbf{A} \) is
Answer: C
Correct answer: \( \partial A_x/\partial x + \partial A_y/\partial y + \partial A_z/\partial z \)
Each component is differentiated with respect to its own coordinate and the three are added, giving a scalar. The first option is one component of the curl, which is built from the cross derivatives, and the second is the Laplacian of a vector.
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