Electrostatic Forces of Plasma Dust Grains with Position-Dependent Charges

        In a recent study [V.N. Tsytovich, Comments Plasma Phys. Controlled Fusion 15, 349 (1994)], Tsytovich claims that two negatively charged particles can attract each other if the particle charges decrease as the distance between the two particles decreases. In this article I show the energy analysis by Tsytovich is erroneous and the electrostatic force between two like-charge particles immersed in a quiet background plasma is always repulsive. Attractive forces between such particles, if exist, therefore must be attributed to other mechanisms.

By: S. Hamaguchi

Published in: RC20397 in 1996

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