Volume 129, Number 5, March 2020
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||02 April 2020|
Structured charged particles in external fields: Charge, current, action, hidden momentum
Department of Physics, Alzahra University - Tehran 1993891167, Iran
Received: 23 December 2019
Accepted: 24 March 2020
The charge and current densities of a structured particle are discussed and, for the case of small particles, expressed in terms of the charge and the electric and magnetic dipoles of the particle. The action for the motion of such particles in external electromagnetic fields is studied and the corresponding energy and momenta are investigated. It is seen that these contain the so-called hidden momenta, which do not vanish even when the particle is at rest.
PACS: 41.20.-q – Applied classical electromagnetism
© EPLA, 2020
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