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22 Pages

lect01_handout

Course: PHYSICS 102, Spring 2012
School: University of Illinois,...
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Word Count: 775

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to Welcome Physics 102! Electricity + Magnetism (at the heart of most processes around us: in atoms & molecules; living cells) Optics Atomic Physics Nuclear Physics Relativity http://www.communicationcurrents.com Please turn cell phones off Physics 102: Lecture 1, Slide 1 Meet the Lecturer ________ Research: @illinois.edu _____________________________________...

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Coursehero >> Illinois >> University of Illinois, Urbana Champaign >> PHYSICS 102

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to Welcome Physics 102! Electricity + Magnetism (at the heart of most processes around us: in atoms & molecules; living cells) Optics Atomic Physics Nuclear Physics Relativity http://www.communicationcurrents.com Please turn cell phones off Physics 102: Lecture 1, Slide 1 Meet the Lecturer ________ Research: @illinois.edu _____________________________________ _____________________________________ Office Hours: ______________________ Physics 102: Lecture 1, Slide 2 Course Website http://online.physics.uiuc.edu/courses/phys102/spring11/ Daily Planner what you should be doing and when you should be doing it Course Description Required Materials Be sure to register your I-Clicker prior to lecture Lectures posted after the lecture is given First Discussion: _________ First Lab: _________ Exam dates: _________ Physics 102: Lecture 1, Slide 3 Course Philosophy Read about it (textbook and prelecture) Untangle it (lectures) Play with it (labs) Challenge yourself (homework) Close the loop (discussion/quiz) The order is important! Physics 102: Lecture 1, Slide 4 Grading Preflights & Lectures Homework Lab (Prelab due at start of lab) Discussion 50 100 150 150 Take-home quizzes; drop lowest 1 Hour Exams (3 x 100) Final Exam 300 250 1000 Physics 102: Lecture 1, Slide 5 Prelectures & ACTS Do it! Answer preflights 50/1000 points 1 point for honest attempt at preflight. 1 point for using clicker in lecture (ACTS) 2 points/lecture x 25 lectures = 50 points Note that there are 28 lectures, so you have some free ones Register I-Clicker before lecture Physics 102: Lecture 1, Slide 6 te! isi u Content Physics 102 Physics 101 req re P Macroscopic Kinematics Forces Energy Fluids Waves (Sound) Physics 102: Lecture 1, Slide 7 Microscopic Electricity+Magnetism Circuits Optics Modern Atomic Nuclear Relativity Physics 102: Lecture 01 Electric charge & Coulombs Law Physics 102: Lecture 1, Slide 8 Origin of Charge Charge is an intrinsic property of matter Two types: Positive Charge: e.g. protons Negative Charge: e.g. electrons Opposite charges attract. Like charges repel. The electric force is what holds stuff together Atoms are neutral Negatively charged electrons orbit around positively charged central nucleus Physics 102: Lecture 1, Slide 9 Conductors and Insulators Q: How do electrons behave in a perfect conductor? Q: How do electrons behave in a perfect insulator? Most things are in between perfect conductor / insulator Physics 102: Lecture 1, Slide 10 Electroscope (+demo) Conduction Charged rod is brought near scope Charged rod touches scope transferring some charge Scope is left w/ same charge as rod +++ +++ + ++ + + ++ + + + + ++ + + ++ ++ ++ Physics 102: Lecture 1, Slide 11 ++ ++ + charge + ++ + + + + + + + + + ++ +++ ++ +++ + ++ + charge Electroscope (+demo) Induction Charged rod is brought near scope Scope is briefly grounded allowing charge to flow on (or off) scope Scope is left w/ opposite charge as rod +++ + ++ + + +++ +++ + + + ++ + + -- --- --- -- +++ - charge Physics 102: Lecture 1, Slide 12 ACTS A negatively charged rod is used to charge an electroscope by induction. What is the resulting net charge on the electroscope? A) positive B) zero C) negative If the conducting electroscope were replaced by an insulating ball and then charged by induction as above, what would be the net charge on the ball. A) positive Physics 102: Lecture 1, Slide 13 B) zero C) negative Coulombs Law Force between charges q1 and q2 separated a distance r: de tu ni ag M D on cti ire 1 2 = 2 1 1 2 Or: = 4 0 2 Coulomb constant = 9 109 2/ 2 Permittivity of free space 0 = 8.85 1012 2/ Opposite charges attract, like charges repel Physics 102: Lecture 1, Slide 14 2 Coulombs Law What is the magnitude of the force on the proton due to the electron in hydrogen? F = k q1q2/r2 Qp=1.6x10-19 C k = 9x109 Nm2/C2 Qe = -1.6x10-19 C + r = 1x10-10 m ag M ud nit e Physics 102: Lecture 1, Slide 15 ACT: Coulombs Law What is the direction of the force on the proton due to the electron? (A) Left (B) Right qp=1.6x10-19 C (C) Zero qe = -1.6x10-19 C + r = 1x10-10 m What is the direction of the force on the electron due to the proton? Physics 102: Lecture 1, Slide 16 Electric dipole A positive and negative charge of equal magnitude separated by a (usually small) distance Ex: water Q 2 - = O H + Physics 102: Lecture 1, Slide 17 H + = +Q + ACT An electric dipole is placed near a large negative charge. What is the net force on the two connected charges? A) Left Physics 102: Lecture 1, Slide 18 B) Zero + C) Right - ACT: Induced Dipole An uncharged conducting sphere is hung next to a charged sphere. What happens when the uncharged sphere is released? 1) Nothing 2) Attracted to charged sphere. 3) Repelled from charged sphere. Physics 102: Lecture 1, Slide 19 Induced Dipole An uncharged conducting sphere is hung next to a charged sphere. What happens when the uncharged sphere is released? Physics 102: Lecture 1, Slide 20 + + + + Demo: Induced Dipole An uncharged conducting sphere is hung between a charged sphere and a grounded sphere and held midway between the two. What happens when the uncharged sphere is released? Physics 102: Lecture 1, Slide 21 Summary of Todays Lecture The concept of charge Conductors and insulators Coulombs Law for the force between charges 1 2 = 2 Much more on Coulombs Law in next lecture Electric dipoles (permanent & induced) Physics 102: Lecture 1, Slide 22
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