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I would like to write a multiline equation in latex

Actually it is the last of these three subequations that needs to be split, but I can't work it out (neither for a single equation) though I tried a thousand split, multline, &quadd, \left\right\ and whatever commands. Is there an extra package I should use?

\begin{subequations} \label{1}

\begin{eqnarray}

p(r) = \frac{Q}{2\pi T} \sum\limits_{i=1}^n \ln{\sqrt{(\frac{a}{2}-d+x)^2+(y- i b)^2}} \label{1.1}\\

p(r) = \frac{Q}{2\pi T} \sum\limits_{i=1}^n \ln{\sqrt{(\frac{a}{2}-d+x)^2+(y+ i b)^2}} \label{1.2}\\

p(r) = \frac{Q}{2\pi T} \sum\limits_{i=0}^n \ln{\sqrt{(\frac{(2i+1)a}{2}+d+(-1)^i x)^2+y^2}} + \frac{Q}{2\pi T} \sum\limits_{i=0}^n \ln{\sqrt{(\frac{(2i+1)a}{2}-d+(-1)^i x)^2+y^2}} \label{1.3}

\end{eqnarray}

\end{subequations}

Thanks in advance!

Sue

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# Multiline equation in latex

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