ons of Maxwell:</p>
<div class="math notranslate nohighlight">
\[\nabla\vec {D} = 4\pi\rho,\]</div>
<div class="math notranslate nohighlight">
\[\nabla\times\vec {H} =\frac {4\pi\vec {\jmath}} {c},\]</div>
<p>where <span class="math notranslate nohighlight">\(\vec {D}\)</span> is the induction of the electric field, <span class="math notranslate nohighlight">\(\vec {H}\)</span> is the magnetic field strength, <span class="math notranslate nohighlight">\(c\)</span> is the speed of light. We use the Stokes th