pzcar

\documentclass{book}

\usepackage{caption}

\begin{document}

\begin{minipage}[b]{.40\textwidth}

\centering

\begin{tabular}{ | l | l |}

\hline

Current (A) & Mean B (G) \\ \hline

& \\ \hline

& \\ \hline

& \\ \hline

\end{tabular}

\captionof{table}{tab:A}

\label{tab:forpol}

\end{minipage}\qquad

\begin{minipage}[b]{.40\textwidth}

\centering

\begin{tabular}{ | l | l |}

\hline

Current (A) & Mean B (G) \\ \hline

& \\ \hline

& \\ \hline

& \\ \hline

\end{tabular}

\captionof{table}{tab:B}

\label{tab:revpol}

\end{minipage}

\end{document}