  We report the first demonstration of an inductively coupled magnetic ring
trap for cold atoms. A uniform, ac magnetic field is used to induce current in
a copper ring, which creates an opposing magnetic field that is time-averaged
to produce a smooth cylindrically symmetric ring trap of radius 5 mm. We use a
laser-cooled atomic sample to characterise the loading efficiency and
adiabaticity of the magnetic potential, achieving a vacuum-limited lifetime in
the trap. This technique is suitable for creating scalable toroidal waveguides
for applications in matterwave interferometry, offering long interaction times
and large enclosed areas.
