svg"
 ALT="$Mn(Ek) = Q _ 0 ~ \sqrt {5 / {16 \pi}}$"></SPAN>.
For a uniformly charged sphere of radius <SPAN CLASS="MATH"><IMG
 STYLE=""
 SRC="img116.svg"
 ALT="$R$"></SPAN>, to first order in <SPAN CLASS="MATH"><IMG
 STYLE=""
 SRC="img117.svg"
 ALT="$\beta_k$"></SPAN> we have
<BR>
<DIV CLASS="displaymath">

<!-- MATH
 \begin{eqnarray}
Mn(Ek) = {{3 ~ Z ~ \beta _ k ~ R^k} \over {4 \pi}}  \ .
\end{eqnarray}
 -->
<TABLE CLASS="equation" WIDTH="100%">
<TR VALIGN="MIDDLE"><TD NOWRAP ALIGN="RIGHT"><IMG
 STYLE=""
 