### Abstract

The Lorentz force of classical electrodynamics, when applied to magnetic materials, gives rise to hidden energy and hidden momentum. Removing the contributions of hidden entities from the Poynting vector, from the electromagnetic (EM) momentum density, and from the Lorentz force and torque densities simplifies the equations of the classical theory. In particular, the reduced expression of the EM force density becomes very similar (but not identical) to the Einstein-Laub expression for the force exerted by electric and magnetic fields on a distribution of charge, current, polarization, and magnetization. Examples reveal the similarities and differences among various equations that describe the force and torque exerted by EM fields on material media. An important example of the simplifications afforded by the Einstein-Laub formula is provided by a magnetic dipole moving in a static electric field and exhibiting the Aharonov-Casher effect.

Original language | English (US) |
---|---|

Article number | 6670795 |

Journal | IEEE Transactions on Magnetics |

Volume | 50 |

Issue number | 4 |

DOIs | |

State | Published - Apr 1 2014 |

### Fingerprint

### Keywords

- Equations
- Force
- Lorentz covariance
- Magnetic field measurement
- Media
- Torque

### ASJC Scopus subject areas

- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials

### Cite this

**The Lorentz Force Law and its Connections to Hidden Momentum, the Einstein-Laub Force, and the Aharonov-Casher Effect.** / Mansuripur, Masud.

Research output: Contribution to journal › Article

}

TY - JOUR

T1 - The Lorentz Force Law and its Connections to Hidden Momentum, the Einstein-Laub Force, and the Aharonov-Casher Effect

AU - Mansuripur, Masud

PY - 2014/4/1

Y1 - 2014/4/1

N2 - The Lorentz force of classical electrodynamics, when applied to magnetic materials, gives rise to hidden energy and hidden momentum. Removing the contributions of hidden entities from the Poynting vector, from the electromagnetic (EM) momentum density, and from the Lorentz force and torque densities simplifies the equations of the classical theory. In particular, the reduced expression of the EM force density becomes very similar (but not identical) to the Einstein-Laub expression for the force exerted by electric and magnetic fields on a distribution of charge, current, polarization, and magnetization. Examples reveal the similarities and differences among various equations that describe the force and torque exerted by EM fields on material media. An important example of the simplifications afforded by the Einstein-Laub formula is provided by a magnetic dipole moving in a static electric field and exhibiting the Aharonov-Casher effect.

AB - The Lorentz force of classical electrodynamics, when applied to magnetic materials, gives rise to hidden energy and hidden momentum. Removing the contributions of hidden entities from the Poynting vector, from the electromagnetic (EM) momentum density, and from the Lorentz force and torque densities simplifies the equations of the classical theory. In particular, the reduced expression of the EM force density becomes very similar (but not identical) to the Einstein-Laub expression for the force exerted by electric and magnetic fields on a distribution of charge, current, polarization, and magnetization. Examples reveal the similarities and differences among various equations that describe the force and torque exerted by EM fields on material media. An important example of the simplifications afforded by the Einstein-Laub formula is provided by a magnetic dipole moving in a static electric field and exhibiting the Aharonov-Casher effect.

KW - Equations

KW - Force

KW - Lorentz covariance

KW - Magnetic field measurement

KW - Media

KW - Torque

UR - http://www.scopus.com/inward/record.url?scp=84923779393&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84923779393&partnerID=8YFLogxK

U2 - 10.1109/TMAG.2013.2291817

DO - 10.1109/TMAG.2013.2291817

M3 - Article

AN - SCOPUS:84923779393

VL - 50

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 4

M1 - 6670795

ER -