Today 3/10  Plates if charge  E-Field  Potential  HW:“Plates of Charge” Due Thursday, 3/13  Lab: “Electric Deflection of Electrons”

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Today 3/10  Plates if charge  E-Field  Potential  HW:“Plates of Charge” Due Thursday, 3/13  Lab: “Electric Deflection of Electrons”

Looking from farther away

+++++ We call this an “infinite plate.”

Field lines for a positive plate  (+)  is the charge on each square meter of the plate. Near the plate the field lines must (by symmetry) point directly away from the plate. How does the field strength at the X’s compare? Same field line density, same strength!

 (+) Field lines for a plate

 (-) Field lines for a negative plate Can’t tell if the field is caused by a pos plate below or a neg plate above!

Size of the E-field For plates: For point charges:  0 = 8.8x C 2 /Nm 2 k = 9.0x10 9 Nm 2 /C 2 Note: no dependence on distance

Two Parallel Plates  (+)  (-)

 (+) Two Parallel Plates  (-)

 (+) Two Parallel Plates  (-) E net

 (+) Two Parallel Plates  (-) E net

 (+) Two Parallel Plates  (-) E net E net = 0

 (+) How big is E?  (-) E net

 (+) How big is E?  (-) E net = 0

 (+) What do the field lines look like?  (-) E = 0 outside!

a. The field at A drops more than the field at B. b. The field at B drops more than the field at A. c. The fields at A and B remain that same. d. The fields at A and B drop by the same amount. AB +Q -Q Points A and B are located as shown between two large uniformly charged parallel plates. Which of the following correctly describes what happens to the electric fields at A and B if the plate on the right is removed?

 0 = Q/A Charged conducting plate What’s wrong with this picture? A = Area of one side

 L =  0 /2 Charged conducting plate Free charge always goes to surface of conductor.  R =  0 /2

 L =  0 /2 Charged conducting plate  R =  0 /2 What is the electric field inside the conductor? E L =  L /2  0 E L =  0 /4  0

 L =  0 /2 Charged conducting plate  R =  0 /2 What is the electric field inside the conductor? E R =  R /2  0 E R =  0 /4  0

 L =  0 /2 Charged conducting plate  R =  0 /2 What is the electric field inside the conductor? The electric field is zero everywhere inside the conductor.