Phys.219_Lec._02.2012

Phys.219_Lec._02.2012 - Lecture 2-1 Coulomb's Law Charges...

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Lecture 2-1 Coulomb’s Law • Charges with the same sign repel each other, and charges with opposite signs attract each other. • The electrostatic force between two particles is proportional to the amount of electric charge that each possesses and is inversely proportional to the distance between the two squared. 12 2 qq Fk r = Coulomb constant: by 1 on 2 & by 2 on 1 2 2 9 0 / 10 99 . 8 4 1 C m N k × = = πε where ε 0 is called the permittivity constant. ( ) 12 2 2 0 8.85 10 / CN m ε
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Lecture 2-2 Example: Q = +10 μC q = -1 μC What is the magnitude of force on Q ? On q ? What is the direction of force on Q ? On q ?
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Lecture 2-3 How strong are Coulomb forces? • Electron and proton in a hydrogen atom • Compare electric and gravitational forces 2 22 pe eg mm e Fk F G rr == electron and proton 2 39 2.27 10 e gp e e FG m m =≈ × 92 2 1 9 7 2 2 1 2 12 (8.99 10 / )(1.60 10 ) (10 ) (5.3 10 ) e Nm C C ON m r ×× ≈≈ = × 7 23 2 30 / (10 ) / e aF Om s Ok g m =
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Lecture 2-4 Principle of Superposition 21 31 net FF F =+ + J KJ K J K " Add by components or Magnitude and direction separately by using trigonometry
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Lecture 2-5 Example 1: Example 2: Q2 Q
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This note was uploaded on 02/05/2012 for the course PHYS 219 taught by Professor Staff during the Spring '08 term at Purdue University.

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Phys.219_Lec._02.2012 - Lecture 2-1 Coulomb's Law Charges...

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