Author

This simulation has been written by Maider Sancho Miranda in partial fulfillment of the requirements for the Degree of Physics, in The University of the Basque Country. It is created with Easy Java Simulations (EJS) by Francisco Esquembre. You can download EJS and learn about it in http://fem.um.es/Ejs/

I thank Juan Mari Aguirregabiria for his dedication and his continuous willingness to help.