\oint Bdl=\mu\int JdA+\mu\frac{{d}}{dt}\int EdA
\int(curlB)dA=\mu\int divJdV+\mu\frac{{d}}{dt}\int divEdV
how to go from the above integral equation to the bottom equation
<br /> curlB=\mu\varepsilon\frac{{dE}}{dt}+\mu J<br />