Review270 - Summary of Electrostatics (Chapters 26-28)...

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Summary of Electrostatics (Chapters 26-28) Matter has a property called charge charge has two signs ± ( - electrons, + protons) Charges exert forces on each other Opposite signs attract Like signs repel Force decreases with distance squared Mathematically expressed as Coulomb’s Law
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Coulomb’s Law #2 q 2 #1 q 1 r ˆ r The force due to charge #2 on charge #1 ! F 2 on 1 = Kq 1 q 2 r 2 ˆ r ˆ r is a unit vector pointing away from #2 (the charge making the force) along a line passing through #1 (the charge experiencing the force). When stated this way all signs and directions are taken care of!
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#2 q 2 #1 q 1 r ˆ ! r The force due to charge #1 on charge #2 Newton’s third law: action-reaction ˆ r reverses sign ! F 1 on 2 = Kq 1 q 2 r 2 ˆ ! r = - ! F 2 on 1
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#2 q 2 #1 q 1 Charges making force: q 1 , q 2 , q 3 , etc. #3 q 3 test charge q ! F on q = ! F
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Review270 - Summary of Electrostatics (Chapters 26-28)...

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