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PHYS 221: Important information Home page: http://www.physics.purdue.edu/phys221/ Syllabus, Calendar, Deadlines, News, etc Web based Homework on CHIP: http://chip.physics.purdue.edu/public/221/spring2012/ Technical help for CHIP: Dr. Saxena Lectures: D. Bortoletto (Monday and Wednesday) Recitation instructor: : R. Niffenegger (every Friday) Laboratory Instructor: Dr. Lewicki You must pass the lab to pass the course Room 144- Undergraduate office Room 11- Help center: http://www.physics.purdue.edu/class/services/HC219221.pdf We will have a 5 minute quiz during almost every lecture Register I-clickers by Wednesday on CHIP 1/9/12 1 D. Bortoletto

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PHYS 221 • Daniela Bortoletto • Particle Physicists working at the LHC (CMS) and at the Tevatron (CDF) 1/9/12 2 D. Bortoletto
Lecture 1 Electric Charges & Coulomb s Law www.ehow.com/how_2180464_ reduce- static-cling.html http://www.diyhappy.com/wp- content/images/Lightning.bmp 1/9/12 3 D. Bortoletto

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Electric Charge Electric charge is an intrinsic characteristic of the fundamental particles that make up objects. + Positive Charge Negative Charge v Electrically neutral: object contains equal amounts of positive and negative charges v Net charge: imbalance in charge 1/9/12 4 D. Bortoletto
Electric Charge Net charge of a system: algebraic sum of all the charges Law: Conservation of charge The net charge of a closed system never changes 1/9/12 5 D. Bortoletto

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Electric Charge Electric charge is quantized •Elementary charge: q = ne , n = ± 1, ± 2, ± 3,. .... e = 1.60602176462(63) x 10 –19 C Coulomb (C): one coulomb is the amount of charge that is transferred through the cross section of a wire in 1 second when there is a current of 1 ampere in the wire. 1/9/12 6 D. Bortoletto
Charge of Particles + Ze neutral atom electron orbits nucleus e e e Electron Proton Neutron e or e - p n e - e + 0 Particles Symbol Charge Nucleus charge= + Ze , atom with Z electrons is neutral .

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