03_10_Plates

# 03_10_Plates - Today 3/10 o Plates if charge l E-Field l...

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Unformatted text preview: Today 3/10 o Plates if charge l E-Field l Potential l HW: “Plates of Charge” Due Thursday, 3/13 l Lab: “Electric Deflection of Electrons” + + + + + + + + + + + + + + + + + + Looking from farther away + + + + + We call this an “infinite plate.” Field lines for a positive plate σ (+) σ 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! σ (+) Field lines for a plate σ (-) 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: 2 ε σ = E For point charges: 2 r kq E s = ε 0 = 8.8x10-12 C 2 /Nm 2 k = 9.0x10 9 Nm 2 /C 2 Note: no dependence on distance Two Parallel Plates σ (+) σ (-) σ (+) Two Parallel Plates σ (-) σ (+) Two Parallel Plates σ (-) E net σ (+) Two Parallel Plates σ (-) E net E net σ (+) Two Parallel Plates σ (-) E net E net E net = 0 E net = 0 σ (+) How big is E?...
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## This note was uploaded on 12/21/2010 for the course PHYS Physics 21 taught by Professor Larrywatson during the Spring '08 term at North Dakota.

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03_10_Plates - Today 3/10 o Plates if charge l E-Field l...

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