An overlooked electrostatic force that acts on a non-charged asymmetric conductor in a symmetric (parallel) electric field

摘要

Usually, when a material that has charge Q is placed in ail electric field E, ail electrostatic force F = QE acts oil the material. This force does not act oil a non-charged material. Nevertheless, when a non-charged material is placed in a convergent field, another electrostatic force acts. This force is called the gradient force. If the material is small and the shape is a sphere, the gradient force can be calculated by ail approximate formula, but it cannot be calculated for other shapes. In this paper the gradient force that acts oil a symmetric rod conductor in a convergent (asymmetric) field was simulated by an axis symmetry finite difference method. Under same simulation conditions Without the next two points, the shape of the conductor and the form of the field were reversed. The shape of the conductor was changed into ail asymmetric shape (e g bat.. shape), and the form of the field was changed into a symmetric (parallel) one The electrostatic force that. acts on the asymmetric conductor ill the symmetric (parallel) field was simulated. It was found that approximately the same intensity force as in the first simulation also acts on this conductor. This force is thought to be ail overlooked electrostatic force. I provisionally call it the asymmetric force in this paper. The asymmetric force with differently shaped conductors Was simulated and it was found that the asymmetric force was maximized for a cup shaped conductor. Finally, the asymmetric force with the cup shaped conductor ill normal and reversed parallel (symmetric) fields was simulated, and it was confirmed that the asymmetric force remains the same in both fields. (C) 2008 Elsevier B.V. All rights reserved.