Is the electrostatic force between a point charge and a neutral metallic object always attractive?

Details Is the electrostatic force between a point charge and a neutral metallic object always attractive? Is the electrostatic force between a point charge and a neutral metallic object always attractive?

2010-07-13

arxiv.org/abs/1007.2175v1

Am. J. Phys. 79, 843-849 (2011)

Physics

Classical Physics

7 pages, 7 figures

Scientific paper

10.1119/1.3595554

We give an example of a geometry in which the electrostatic force between a point charge and a neutral metallic object is repulsive. The example consists of a point charge centered above a thin metallic hemisphere, positioned concave up. We show that this geometry has a repulsive regime using both a simple analytical argument and an exact calculation for an analogous two-dimensional geometry. Analogues of this geometry-induced repulsion can appear in many other contexts, including Casimir systems.

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