Discussion
The identity \( \nabla \cdot (\nabla \times \mathbf{A}) \) is equal to
Answer: A
A curl field has no sources, so its divergence vanishes identically. This is why the magnetic flux density, being the curl of the vector potential, satisfies \( \nabla \cdot \mathbf{B} = 0 \) and magnetic monopoles do not appear.
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