Lecture 13

# Lecture 13 - Monday February 25 Announcements No Homework...

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Monday, February 25, Announcements No Homework due this week Homework 6 (pickup assignment) due March 5 Pickup all graded homework and quizzes today Midterm Exam – Wednesday (2/27) Chapters 1 – 9 Bring one 8.5x11” page (2-sides) for reference Numerical values of constants are provided Can bring calculator Sample Midterm (handed out last week, on web) Solutions (on web now) Mini-Midterm Review – part of today’s class Discussion Sessions (7 – 9 PM, YKK220-001) on Monday and Tuesday evenings Other help – by arrangement (email: TAs) Updated grade sheet is posted on the web Questions about mid-term?

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Electricity and Electrostatics Today’s lesson Van de Graaf generator revisited Electrostatic Force – Coulomb’s Law Electric Field Electric Potential Mini-Midterm Review
“Van de Graaff” Generator

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Electrostatic Force - Coulomb’s law How do we describe the force between charged objects? (its variation with distance and charge?) Coulomb’s Law : 2 charges exert equal and opposite forces (in straight line) Coulomb’s law and gravitational force Question - In what ways similar? In what ways different? Quest to explain the fundamental forces of nature “Unified Field Theory” q 1 q 2 r 2 F = k q 1 q 2 = charges of 1,2 k = Coulomb’s constant = 9 x 10 9 N m 2 /C 2 r = charge separation C = Coulomb = unit of charge e =1.6 x 10 -19 C m 1 m 2 r 2 F = G q 1 q 2 r 2 F = k satellite planet electron proton
Electric Forces and Electric Field Coulomb’s force/law - Assumes objects are small (point charges) compared to the distance between them What about large objects ? Electric field Concept of a field in physics Force field, can exist in a vacuum magnetic, gravitational,… For more than two charges Use force vectors and compute the force on any one by adding forces Force on one charge due to two other charges Total force on the middle charge: F 1 F 2 F = F 1 + F 2

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Lecture 13 - Monday February 25 Announcements No Homework...

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