# lecture03 - iClicker issues (still)? Check your lecture...

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iClicker issues (still)? Check your lecture grades (up to date) Missing iClicker grade? Email me Name NetID iClicker ID (Illini bookstore) Remember to switch frequency to “BB”

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Physics 102: Lecture 3 Electric Potential Energy & Electric Potential
Overview for Today’s Lecture Electric Potential Energy/ Work Uniform fields Point charges Electric Potential (like height) Uniform fields Point charges 07

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Recall Work from P101 Work done by the force given by: W = F d cos( θ ) Positive: Force is in direction moved Negative: Force is opposite direction moved Zero: Force is perpendicular to direction moved Careful ask WHAT is doing work! Opposite sign for work done by you ! Conservative Forces Potential Energy = - W 09
A B C Uniform E - In what direction does the force on a negative charge at point A point? 1) left 2) right 3) up Preflight 3.1 !!!!ACT!!!! 10 51% 48% 1% F Electric field points in the direction a POSITIVE charge would feel force. S e t y o u r i C l c k F q n B

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A B C Uniform E - - - - - When a negative charge is moved from A to C the ELECTRIC force does 1) positive work. 2) zero work. 3) negative work. 10% 85% 05% Preflight 3.2 11
A B C Uniform E When a negative charge is moved from A to C the ELECTRIC force does 1) positive work. 2) zero work. 3) negative work. 6% 89% 5% - F - F - F - F - F 11 “I would say zero because the path  is perpendicular to the field” motion Preflight 3.2

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A B C Uniform E When a negative charge is moved from A to B the ELECTRIC force does 1) positive work. 2) zero work.
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## This note was uploaded on 01/25/2012 for the course PHYS 102 taught by Professor Lee during the Spring '08 term at University of Illinois, Urbana Champaign.

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lecture03 - iClicker issues (still)? Check your lecture...

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