Topic: Electromagnetics
Which of the following does not represent Maxwell's Equation?
- A. $\oint E\cdot ds=-\int\frac{\partial B}{\partial t}\cdot da$
- B. $\oint D\cdot da=\int\rho\cdot dV$
- C. $\nabla\times H=B+J$
- D. $\oint B\cdot da=0$
Answer: C. $\nabla\times H=B+J$
Explanation: Maxwell's equations: $\oint\vec{D}\cdot\vec{ds}=\int\rho_{v}dv$, $\oint\vec{E}\cdot\vec{ds}=-\int\frac{\partial\vec{B}}{\partial t}\cdot ds$, $\oint\vec{B}\cdot\vec{ds}=0$, $\nabla\times\vec{E}=-\frac{\partial\vec{B}}{\partial t}$, $\nabla\cdot\vec{B}=0$, $\nabla\cdot\vec{D}=\rho_{v}$, $\nabla\times\vec{H}=\vec{J_{C}}+\vec{J_{D}}$ or $\oint\vec{H}\cdot\vec{dl}=\oint\vec{J_{C}}\cdot ds$. So incorrect option is (c).