form.tex

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\begin{document}
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% \examname{电子技术基础实验}
\DefineAnswerWrapper{\begin{description}\item [\AnswerLeading:]}{\end{description}}
\def\namedata{\large
Number\underline{\hspace{121pt}}Name\underline{\hspace{98pt}}}
% \class{\large 学院(部)\underline{\hspace{98pt}}年级\underline{\hspace{98pt}}专业\underline{\hspace{98pt}}}
\begin{examtop}
\begin{center}
\begin{tabular}{r}
    {\Large \bf QUIZ 1}
    {\large \hspace{48pt}2016 }
\end{tabular} \medskip \\
\namedata
\end{center}
% \bigskip
\end{examtop}

\newcommand\mathdot[1]{\dot#1}

\begin{shortanswer}

\begin{question}
    An air stripline with strips of width $a$ that are a distance $d$
    apart, carries a steady current of intensity $I$. The potential
    difference between the strips is $U$. Prove that the flux of the
    Poynting vector through a cross section of the air stripline is
    $UI$. Neglect the edge effects.
\end{question}

\begin{question}
    The stripline from the preceding problem is connected to a
    sinusoidal generator of emf $U$ and angular frequency $\omega$. The
    other end of the line is connected to an inductor of inductance $L$.
    Calculate the flux of the Poynting vector in complex form through a
    cross section of the air stripline. Check whether the image part of
    the calculated flux is equal to the reactive power of the inductor.
\end{question}

\end{shortanswer}
\end{document}