Using an explicit line integral, calculate the work required to
bring in the test mass along the path drawn below, to the point $P$
of question a.  Compare the work to your answer from question a.

%/*
\bigskip
\centerline{\includegraphics[scale=0.5]{\TOP Figures/vfmass2}}
\medskip
%*/

%*{{homework:figures:vfmass2.png?300|Figure: integration path for parts d)}}