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+### Statement
+
+$12.1.6.$ [Insert the problem statement]
+
+### Solution
+
+
+Let $ab=L$.By applying the law of electromagnetic induction to the countour $baa'b'$ we get:
+
+
+
+\begin{equation}
+E L=\frac{d\Phi}{dt}
+\end{equation}
+
+
+
+In time $dt$ the wave moves a distance $cdt$.So the change of the magnetic flux is:
+
+\begin{equation}
+d\Phi=BLcdt
+\end{equation}
+
+
+
+By plugging eq(2) into the first we find that(in SI units):
+
+
+\begin{equation}
+B=\frac{E}{c}
+\end{equation}
+
+
+
+In Gaussian units Faraday's law for the same countour looks like:
+
+\begin{equation}
+EL=\frac{1}{c}\frac{d\Phi}{dt}
+\end{equation}
+
+
+
+So the answer in CGS units is:
+
+\begin{equation}
+B=E
+\end{equation}
+
+#### Answer
+
+[Insert a concise answer or boxed result]