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    • Keywords


      Plasma/colloid; Boltzmann density; Poisson equation; Gauss law.

    • Abstract


      We demand that the Gauss law at the edge must be obeyed by the electric potential $\phi(r)$ generated within a neutral plasma/electrolyte of strictly finite size by the introduction of a test charge $q_{b}$. Our proposal has the nice features that total ionic numbers are conserved, the point-Coulomb behaviour of $\phi(r)$ is guaranteed at short-distance, and accumulation of induced charges near the centre and the surface can be demonstrated rigorously. In contrast, the standard Debye–Hückel potential $\phi_{D}(r)$ applicable to unbounded plasma has the strange features that the Gauss law cannot be obeyed at the plasma's edge, total ionic numbers themselves are altered, the short-distance Coulomb behaviour has to be imposed by hand, and induced charge appearance at the surface cannot be built-in.

    • Author Affiliations


      Ritesh Kumar Dubey1 V J Menon1 Madhukar Mishra1 Mukesh Kumar Pandey1 B K Patra2

      1. Department of Physics, Banaras Hindu University, Varanasi 221 005, India
      2. Department of Physics, Indian Institute of Technology, Roorkee 241 667, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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