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04 - Electric Field II

# 04 - Electric Field II - Phys 212 Fall 2009 Electric Field...

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Phys 212 - Fall 2009 8/28/2009 Electric Field II

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Review - Field of a Point Charge E = F q 0 = k | q || q 0 | r 2 q 0 = k | q | r 2 E Field of a Point Charge Points in radial direction Depends only on source charge strength Gets weaker as 1/r 2 q 0 r !"! \$!!"! %!!!"! %\$!!"! &!!!"! &\$!!"! ’!!!"! ! !"% !"& !"’ !"( !"\$ E- Field distance Physics Idea: Use Coulomb’s Law in definition of E field
Field and Force I Between the red and the blue charge, which of them experiences the greater electric field due to the green charge? +2 +1 +1 +1 d d 1) red 2) blue 3) same for both

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Field and Force II Between the red and the blue charge, which of them experiences the greater electric force due to the green charge? +2 +1 +1 +1 d d 1) red 2) blue 3) same for both
Electric Field Strength Try this at home!

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Field Lines for Multiple Charges Use test charge and find net force
Field Line Rules 1. Field lines point away from positive charges. 2. Field lines point toward negative charges. 3. Field lines fill space continuously.

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