Charged Magnetic Dipole Research Articles

Angular momentum and the electromagnetic top

The electric charge–magnetic dipole interaction is considered. If Γem is the electromagnetic and Γmech the mechanical angular momentum, the conservation law for the total angular momentum Γtot holds: Γtot=Γem+Γmech= const., but when the dipole moment varies with time, Γmech is not conserved. We show that the non-conserved Γmech of such a macroscopic isolated system might be experimentally observable. With advanced technology, the strength of the interaction hints to the possibility of novel applications for gyroscopes, such as the electromagnetic top.

Super-Zeeman embedding models on N-supersymmetric world-lines

We construct a model of an electrically charged magnetic dipole with arbitrary N-extended world-line supersymmetry, which exhibits a supersymmetric Zeeman effect. By including supersymmetric constraint terms, the ambient space of the dipole may be tailored into an algebraic variety, and the supersymmetry broken for almost all parameter values. The so-exhibited obstruction to supersymmetry breaking refines the standard one, based on the Witten index alone.

The Poynting vector of a charged magnetic dipole: two limiting cases

We consider the Poynting vector of two exact solutions describing a charged magnetized non-rotating mass in the following limiting cases: (i) m2 = q2, and (ii) m = 0. Whereas the former limit leads to a non–vanishing Poynting vector only for one of the solutions, the latter limit in both solutions results in non–zero expressions of the azimuthal component of the Poynting vector, thus providing evidence that Bonnor's frame–dragging effect takes place even in the case of a charged massless magnetic dipole.

Frame dragging, vorticity and electromagnetic fields in axially symmetric stationary spacetimes

We present a general study about the relation between the vorticity tensor and the Poynting vector of the electromagnetic field for axially symmetric stationary electrovacuum metrics. The obtained expressions allow us to understand the role of the Poynting vector in the dragging of inertial frames. The particular case of the rotating massive charged magnetic dipole is analysed in detail. In addition, the electric and magnetic parts of the Weyl tensor are calculated and the link between the latter and the vorticity is established. Then we show that, in the vacuum case, the necessary and sufficient condition for the vanishing of the magnetic part is that the spacetime be static.

New electromagnetic bound states

We formulate a Dirac Hamiltonian for an electron in the field of a charged magnetic dipole, which can be solved exactly in a central field approximation. While we find no scattering resonances, we do find three categories of bound-state solutions for this Hamiltonian which may represent new electron/positron states or possible new electromagnetic composites. One category of solution is a state with very strong binding energy (greater than the electron rest mass) but with only a small amount of kinetic energy. This state corresponds to a classical orbit picture in which the electric and magnetic forces are opposed and are almost balanced. No bound states are found if the central magnetic dipole is uncharged.

Dragging of inertial frames by a charged magnetic dipole

Dragging of inertial frames is normally associated with rotating bodies. I consider here a static massive charged magnetic dipole, and show that its gravitational field drags inertial frames, and causes gyroscopes to precess. A numerical estimate of the effect is given, and an experiment is suggested.