Lecture 22a

# Lecture 22a - Which are the best Conductors David's Whizzy...

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Which are the best Conductors? David's Whizzy Periodic Table Periodic Table of the Elements Electrical Conductivity

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How does q2 “know” that q1 is present? 1 q 1 Chapter 22: Electric Field Charge q1 creates electric field E E exerts a force on q2 Michael Faraday
Definition of Electric Field Units: [N/C] Direction of E is the direction of the force on a positive test charge q F E q on . Test charge q at point P

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4 E-field around a point charge Q Q = "source charge" q = "test charge" distance = r 1) Force on q (if it is there) 2) Electric Field r r kqQ F ˆ 2 r r kQ r r kqQ q q F E ˆ ˆ 1 2 2
E E Field of a point charge: Visualize with vectors Class Question: A.This is a positive charge B. This is a negative charge

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Visualize E with Field lines Field lines never cross each other
Demo: E Field of Van de Graaff Electric Breakdown in Air |E| ~ 10 6 N/C Paper strips to show E

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8 E-field from multiple charges add the E-fields due to the individual charges .
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