  We study semiclassical string solutions on the 1/2 BPS geometry of type IIB
string theory characterized by concentric rings on the boundary plane. We
consider both folded rotating strings carrying nonzero R-charge and circular
pulsating strings. We find that unlike rotating strings, as far as circular
pulsating strings are concerned, the dynamics remains qualitatively unchanged
when the concentric rings replace AdS_5\times S^5. Using the gravity dual we
have also studied the Wilson loop of the corresponding gauge theory. The result
is qualitatively the same as that in AdS_5\times S^5 in the global coordinates
where the corresponding gauge theory is defined on S^3\times R. We show that
there is a correction to 1/L leading order behavior of the potential between
external objects.
