Physics 212 Spring 2011 Section 150
Course organization Sample PRS (Personal Response System) question Begin Chapter 21 (Electric Charge and Electric Field) Electric charge Where does charge come from? Coulombs Law Coulombs Law examples
Physics 212 Sprin
CHAPTER 21 Coulombs Law Electric Field
Coulombs Law
Charles Coulomb
Fundamental electric constants
k = 8.99*109 N*m2/C2 (in SI system)
1 k= , where 0 is dielectric constant of vacuum 4!" 0
0 = 8.85*10-12 C2/N*m2
What force acts between two point charges 1
CHAPTER 21 Electric Field
Electric Field Concept
A charged object changes the properties of space around it by generating an electric eld. To nd out if there is an electric eld at a certain point, place a test charge in this point and see if there is an e
CHAPTER 21 Electric Field
Field of a ring of charge
Find electric eld at a point P on the axis of the ring with radius a carrying a total charge Q at a distance x from its center
" o = 8.85 # 10$12 C 2 /( N % m2 )
1 xQ Ex = 2 2 32 4 "#0 ( x + a ) ! E = E
CHAPTER 22
Gausss Law
Overview of Gauss Law Denition of Electric Flux Through a single plane surface Through a closed surface Statement of Gausss Law
Gausss Law
Gauss' law, also known as Gauss' flux theorem, is a law relating the distribution of electric