Problemes empaquetats. Camp elèctric Authors Octavi Plana Abstract Buscant una mica podem trobar molts contextos que mostren, de nou, que la física que estudien els nostres alumnes és rellevant per al món que els envolta; que val la pena fer l’esforç d’acostar l’aula a les aplicacions i desenganxar-los una mica de problemes que només viuen sobre el paper. En el primer exemple, encara que seria possible trobar-ne molts d’aplicats als tubs de raigs catòdics de televisió (aquí el currículum ha quedat molt ràpidament antiquat!) , s’ha buscat una situació equivalent encara que menys coneguda. Downloads Download data is not yet available. Downloads PDF (Català) Issue Núm. 14 : Tardor del 2014 Section [Altres] License The intellectual property of articles belongs to the respective authors.On submitting articles for publication to the journal Recursos de Física, authors accept the following terms:Authors assign to Societat Catalana de Física (a subsidiary of Institut d’Estudis Catalans) the rights of reproduction, communication to the public and distribution of the articles submitted for publication to Recursos de Física.Authors answer to Societat Catalana de Física for the authorship and originality of submitted articles.Authors are responsible for obtaining permission for the reproduction of all graphic material included in articles.Societat Catalana de Física declines all liability for the possible infringement of intellectual property rights by authors.The contents published in the journal, unless otherwise stated in the text or in the graphic material, are subject to a Creative Commons Attribution-NonCommercial-NoDerivs (by-nc-nd) 3.0 Spain licence, the complete text of which may be found at https://creativecommons.org/licenses/by-nc-nd/3.0/es/deed.en. Consequently, the general public is authorised to reproduce, distribute and communicate the work, provided that its authorship and the body publishing it are acknowledged, and that no commercial use and no derivative works are made of it.The journal Recursos de Física is not responsible for the ideas and opinions expressed by the authors of the published articles.