  Simple physics ideas are used to derive an exact expression for a flat
connection on the complement of a torus knot. The result is of some
mathematical importance in the context of constructing representations of the
knot group -- a topological invariant of the knot. It is also a step forward in
the direction of obtaining a generalisation of the Aharonov-Bohm effect, in
which charged particles moving through force-free regions are scattered by
impenetrable, knotted solenoids.
