\oint_{\partial S} {{\mathbf{B}} \cdot {\text{d}}{\mathbf{l}}} = \mu _0 \int_S {{\mathbf{J}} \cdot {\text{d}}{\mathbf{A}}} + \mu _0 \varepsilon _0 \frac{{\text{d}}}
{{{\text{dt}}}}\int_S {{\mathbf{E}} \cdot {\text{d}}{\mathbf{A}}}