SciELO - Scientific Electronic Library Online

 
vol.37 issue1Geometric construction of the Mars’s orbit by the method of KeplerKirchhoff’s voltage law corrected for radiating circuits author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Revista Brasileira de Ensino de Física

Print version ISSN 1806-1117On-line version ISSN 1806-9126

Abstract

LARA, V.O.M.; LIMA, A.P.  and  COSTA, A.. Entropic considerations in the two-capacitor problem. Rev. Bras. Ensino Fís. [online]. 2015, vol.37, n.1, 1306.  Epub Mar 30, 2015. ISSN 1806-1117.  http://dx.doi.org/10.1590/S1806-11173711650.

We study the well-known two-capacitor problem from a new perspective, focusing on the thermodynamic aspects of the discharge process. The free electron gas model is used to describe the electrons’ energy levels in both capacitors in the low temperature regime. We assume an isothermal heat exchange between the resistor and the heat reservoir. Even in this limiting case, we obtain a positive entropy variation due to the discharge, which points out the irreversibility of this process.

Keywords : two-capacitor problem; entropy.

        · abstract in Portuguese     · text in English     · English ( pdf )