Topic: Electromagnetics
The divergence of magnetic intensity is
- A. electric charge density
- B. electric field intensity
- C. zero
- D. conduction current density
Answer: C. zero
Explanation: According to Gauss's law in magnetostatics, $\nabla \cdot \vec{B} = 0$ or $\iint \vec{B} \cdot \vec{ds} = 0$. This implies that the divergence of a magnetic field is always zero, which mathematically represents that isolated magnetic poles (magnetic monopoles) do not exist.