21142 - FISICA ELECTROMAGNETICAJORGE LUIS NAVARRO ESTRADA-ProfesorIniciacin de clases 2 de Febrero de 2015 Perodo de digitacin de la primera nota parcial por internet 24 de Marzo al 4 de Abril de 2015 Perodo de digitacin de la segunda nota parcial por internet 4 al 17 de Mayo de 2015 Perodo de digitacin de la tercera nota parcial por internet 25 de Mayo al 12 de Junio de 2015 Finalizacin de clases 23 de Mayo de 2015 21 de Noviembre de 2015

Carnavales 14 al 17 de febrero de 2015Semana Santa 29 de Marzo al 5 de Abril de 2015

CALIFICACIN: Parte terica (sin tener en cuenta el laboratorio)30%: 30% Primer Parcial (Electric Charge, Electric Fields, Gauss'Law, Electric Potential) 40%: 20% Examen Intermedio (Electric Potential, Capacitance, Current and Resistance) + 20% Tareas, Participacin. 30%: Examen Final (Magnetic Fields, Magnetic Fields Due to Currents, Induction and Inductance)Total: 100%Habilitaciones (TODO lo visto en el curso) del 12 al 13 de Junio de 2015.

ComentarioYou are surrounded by devices that depend on the physics of electromagnetism,which is the combination of electric and magnetic phenomena. Thisphysics is at the root of computers, television, radio, telecommunications, householdlighting, and even the ability of food wrap to cling to a container. Thisphysics is also the basis of the natural world. Not only does it hold together allthe atoms and molecules in the world, it also produces lightning, auroras, andrainbows.The physics of electromagnetism was first studied by the early Greekphilosophers, who discovered that if a piece of amber is rubbed and then broughtnear bits of straw, the straw will jump to the amber. We now know that the attractionbetween amber and straw is due to an electric force. The Greek philosophersalso discovered that if a certain type of stone (a naturally occurring magnet) isbrought near bits of iron, the iron will jump to the stone. We now know that theattraction between magnet and iron is due to a magnetic force.From these modest origins with the Greek philosophers, the sciences ofelectricity and magnetism developed separately for centuries-until 1820, in fact,when Hans Christian Oersted found a connection between them: an electric currentin a wire can deflect a magnetic compass needle. Interestingly enough,Oersted made this discovery, a big surprise, while preparing a lecture demonstrationfor his physics students.

The news Cience of electromagnetism was developed further by workers inmany countries. One of the best was Michael Faraday, a truly gifted experimenterwith a talent for physical intuition and visualization. That talent is attested to bythe fact that his collected laboratory notebooks do not contain a single equation.In the mid-nineteenth century, James Clerk Maxwell put Faraday's ideas intomathematical form, introduced many new ideas of his own, and put electromagnetismon a sound theoretical basis.Our discussion of electromagnetism is spread through the next 16 chapters.We begin with electrical phenomena, and our first step is to discuss the nature ofelectric charge and electric force.

Electric ChargeIn dry weather, you can produce a spark by walking across certain types of carpetand then bringing one of your fingers near a metal doorknob, metal faucet, oreven a friend. You can also produce multiple sparks when you pull, say, a sweaterfrom your body or clothes from a dryer. Sparks and the "static cling" of clothing(similar to what is seen in Fig. 21-1) are usually just annoying. However, if youhappen to pull off a sweater and then spark to a computer, the results are morethan just annoying.

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