Accepted Monday Oct 19, 2009
The interaction energy due to the electromagnetic field fluctuations between two infinitely long straight parallel dielectric-diamagnetic cylinders immersed in a medium is considered. We make use of the mode summation method for the calculations. We investigate the energy dependence on the cylindrical radial curvature and dielectric response of the involved materials. It is shown that the sign of the interaction energy can be changed by a suitable choice of the involved objects. The condition for the relation of the material dielectric properties for repulsive interaction is obtained to be the same as the one for planar materials.