Puede parecer extraño pero todos los materiales están formados por átomos los cuales a su vez están constituidos por partículas electrizadas; una prueba de ello es la forman como se atraen ciertos cuerpos. Estos fenómenos no solo lo explica la química, sino también la física que a través de estudios previos se logró clasificar los diferentes mecanismos por los cuales los cuerpos se atraen y estos son: electrización por contacto, frotamiento e inducción.
Este tipo de electrización se debe al movimiento de cargas negativas de un material a otro. Se puede tener un material cargado con cargas positivas debido a que sus átomos presentan una “falla” de electrones, que luego será equilibrado por la participación de un cuerpo neutro cuando estos están en contacto; por lo tanto obtendremos que el cuerpo cargado se haga menos positivo y el cuerpo neutro gane la carga eléctrica positiva.
Incluso si lo que ocurre es una transferencia de electrones desde el material neutro al que está cargado de manera positiva, todo ocurre de manera tal que el cuerpo positivo hubiese cedido parte de su carga al cuerpo neutro. Ahora bien, si el material tiene originalmente carga negativa, ocurre una cesión de electrones a través de una transferencia de carga negativa de uno a otro.
Si frotamos sustancias como el vidrio o la ebonita (caucho endurecido) con una piel o una tela de seda, notaremos que adquieren la capacidad de atraer trocitos de papel u otros objetos ligeros. Incluso un peine de plástico puede adquirir la propiedad de atraer objetos livianos, como plumas de ave o trocitos de papel, si lo frotamos en la ropa.
La electrización por fricción se puede demostrar fácilmente frotando ligeramente a la piel un globo inflado y acercándole una varilla de ebonita, la cual ha sido frotada fuertemente con un pedazo de lana; se observa que el globo es repelido por la varilla. Si en lugar de la varilla de ebonita se acerca una varilla de vidrio frotada con seda, se observará que el globo es atraído por la varilla.
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