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Welcome to Physics 212!

Welcome to Physics 212!. General Physics II Electricity, Magnetism & Light. Pick up 2 items at entrance:. Syllabus Assignment 1. SU PHY212 General Physics II Fall 2003. Course staff:

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Welcome to Physics 212!

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  1. Welcome to Physics 212! General Physics II Electricity, Magnetism & Light Pick up 2 items at entrance: • Syllabus • Assignment 1

  2. SU PHY212 General Physics II Fall 2003 Course staff: • Lecturers: Prof. Cristina Marchetti, phy212@phy.syr.edu Prof. Maxim Marchevsky, marchev@phy.syr.edu • Workshop instructors: • Prof. Maxim Marchevsky • Joe Drenchko & John Fitzgibbons • Alphonso Magri • Eric West • Undergrad. secretary: Arlene Johnston, Rm. 111 • “Physics coaches” (currently 4)

  3. Physics Laboratory Course (PHY 222) This is required co-requisite for Phy 212 • Faculty: Prof. Peter Saulson • Separate course • Independently graded • Register separately • Labs will start week of 1/21/03

  4. Course Information(http://physics.syr.edu/courses/PHY212) • Books • -Serway and Beichner, Vol 2 • -Tutorials in Introductory Physics , McDermott et al. (2 vols) • Syllabus: information on course structure, rules, grading policy, etc. • Course calendar with exams and (tentative) quiz dates available on web page • Assignments: handed out weekly Please consult the course web page for all organizational questions

  5. Weekly course components • Reading from textbook • Tuesday lecture • Wednesday workshop (Tutorials) • Thursday lecture • Friday workshop (Probl. Solv. Activities) • Weekly homework sets (due by 5pm each Friday)

  6. Evaluation & course grade 3 exams (lowest dropped): 35% 6-7 in-class quizzes (lowest 2 dropped): 15% workshop participation: 15% final exam: 35% weekly homework sets: up to 10 bonus points on the final exam See web page for details

  7. Workshop sections for Physics 212 Sections 002 - 007: 104 Physics Build. Sections 008 - 009: 106 Physics Build. All sections meet Wednesdays and Fridays. You must put your section # and the name of your workshop instructor on all tests & hw

  8. Students are strongly encouraged to populate the workshop section 009 11:45am-12:40pm If you are in 005 11:45am-12:45pm consider moving to 009 which is at the same time. High-enrollment sections: 003 - 9:35-10:30A 005 – 11:45A-12:40P 005 – 12:50-1:45P Low enrollment sections: 009 – 11:45A-12:40P 008 – 10:40-11:45A

  9. Course Outline • Weeks 1-5: Electrostatics • Weeks 6: Electrical currents • Weeks 7-9: Magnetic field & electromagnetic induction • Weeks 10-11: Maxwell’s eqs. & electromagnetic waves • Weeks 11-14: Light & optics

  10. Physics 212 Fall 2003 Agenda for this week: Tuesday: Electric charges and forces Wednesday: Tutorial on charge Thursday: Electric field Friday: Problem Solving Activity on Finding the electric field of a distribution of point charges

  11. The Electric Charge Experiments done by Benjamin Franklin and Charles Coulomb in the 18th century led to the understanding of the properties of the electric charge and the electric force among charges.

  12. Findings Some objects, after having been rubbed against each other, exert an attractive or a repulsive force on each other. This is called the electric force. Various experiments with glass rod rubbed with silk and rubber rod rubbed with fur.

  13. Main points so far: • Two types of charges: positive and negative • Like charges repel - unlike charges attract • Charge is conserved • Charge is quantized in multiples of |e|

  14. Dry human skin (++++++) Leather Rabbit fur Glass Human hair Nylon Wool Lead Silk Aluminum Paper Cotton (+) Wood (-) Amber Hard rubber Nickel, copper Brass,silver Gold, platinum Polyester Styrofoam Saran wrap Polyethylene (e.g., scotch tape) Vinyl (PVC) Silicon Teflon (- - - - - - ) The Triboelectric series

  15. Charge can move easily Polarization (soda can) Charge by induction Charge does not move When charged by rubbing, charge remains localized in the area rubbed Conductors vs Insulators

  16. Coulomb’s Law The magnitude of the force between two charges q and Q separated by a distance r • Is proportional to the charges F ~ q Q • Is proportional to the inverse square of the distance F ~ 1/r2

  17. Coulomb apparatus

  18. Principle of Superposition: The NET FORCE due to a distribution of point charges is the VECTOR SUM of the forces due to each charge.

  19. Summary for Today • Two types of charges: + and - • Like charges repel, unlike attract • Conductors vs insulators • Coulomb law for the force between charges • Net force from many charges is the vector sum of the forces from each • Know how to add vectors!

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