Electrodynamics of a charged rotating disk

Authors

Jose M. Esmeria, Jr. TDK Philippines Corporation, Laguna Technopark
Emmanuel Rodulfo Physics Department, De La Salle University
Romeric Pobre Physics Department, De La Salle University
Robert Roleda Physics Department, De La Salle University

Abstract

We discuss the electrodynamics of a charged rotating disk. The free electrons in a metallic disk are thought of as being subject to the collective electric potential of the atomic nuclei of the disk. Thus consider the appropriate model of a uniformly charged conducting disk. We calculate the potential that the free electrons must overcome if they are to be redistributed as a result of the rotation of the disk. Once the disk is in rotation, the free electrons experience two radially outward forces: the mechanical force due to the rotation as well as the magnetic force exerted by the magnetic field set up by the rotational motion. These interactions subsequently modify the distribution of free electrons in the disk resulting in a density that is more pronounced near the rim of the rotating disk. This theoretical model will hopefully shed more light on the charge generation problem encountered in the rotating lapping plate process in GMR sensor manufacturing.

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Issue

2004: Proceedings of the 22nd Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2004-PB-31

Section

Poster Session PB

Published

2004-10-25

How to Cite

[1]

JM Esmeria, E Rodulfo, R Pobre, and R Roleda, Electrodynamics of a charged rotating disk, Proceedings of the Samahang Pisika ng Pilipinas 22, SPP-2004-PB-31 (2004). URL: https://proceedings.spp-online.org/article/view/SPP-2004-PB-31.