Lec2 - Physics 8B Professor Catherine Bordel 08/30/10...

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Physics 8B Professor Catherine Bordel 08/30/10 Lecture 2 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy, or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. ANNOUNCEMENTS Before we start the lecture, I just wanted to remind you that I posted some homework for you guys to practice and learn how to do mastering physics. It’s not for credit, and there’s a real set of homework for Friday night. If you still have a problem with your section, please come and talk to me so everyone can find a section that they’re happy with. Keep in mind you have to attend your sections because there is a drop deadline next Friday. If you have a medical reason, let me or Michelle know. LECTURE We stopped last time with Coulomb’s law. It gives you the interaction force between two point charges, called q 1 and q 2 located at P 1 and P 2 . F 12 is the force created by q 1 exerted on q 2 . Usually if you see P or M, it is the name of the position in space, q is used for the charge, and r is the distance. We have two point charges, like last lecture, the unit vector is called r ˆ. In this case, the unit vector points away from q 1 . The unit vector points away from the charge creating the force by convention. r r q kq F ˆ 2 2 1 12 = This expression gives the interaction between two point charges, with one being the origin and the other sensing the force. That constant k = 1/4πε 0 . ε 0 is the dielectric constant of vacuum. The numerical values don’t matter, so I don’t need to give that to you. It will be given if needed for calculations. Do you remember the SI unit for force? Student
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This note was uploaded on 10/02/2010 for the course PHYSICS 8B taught by Professor Shapiro during the Spring '07 term at University of California, Berkeley.

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Lec2 - Physics 8B Professor Catherine Bordel 08/30/10...

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