Signs and Polarized/Magnetic versions of the Casimir Forces

Abstract

We consider versions of the Casimir effect where the force can be controlled by changing the angle between two Casimir ``plates'' or the temperature of two nearby rings. We also present simple arguments for the sign of Casimir forces.

Comments: 3 pages of double column revtex, + 4 figures. For correspondence use Tel Aviv address, or nussinov@ccsg.tau.ac.il