# lecture5 - Gauss’s Law •Electric Flux •Gauss’s Law...

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Unformatted text preview: Gauss’s Law •Electric Flux •Gauss’s Law •Examples Text 24.1—24.2 Practice Problems: Chapter 24, problems 1, 3, 5, 8, 9, 11, 17 What’s in the box ?? Electric Flux Electric Flux Φ E t h e “ n u m b e r o f f i e l d l i n e s t h r o u g h a s u r f a c e S ” For uniform , define : E r ⊥ ⋅ = Φ A E E r where is the “area perpendicular to “ ⊥ A . E r ( U n i t s : N•m 2 /C) S ⊥ A θ n ˆ θ φ cos A so... sin A : Note A A = ⊥ = ⊥ φ E Notes: Notes: 1) Φ E is a scalar . 2) Units: N•m 2 /C 3) Φ is a q u a n t i t a t i v e measure of “the number of E field lines through S.” 4) Φ E refers to flux through some particular surface S.” n ˆ Unit vector surface (“unit normal”) ⊥ Area A Define “area vector” : n A ˆ ) ( ⋅ = area r ea r A r A Then for uniform E, A E E A E r r • = = Φ θ cos area | | = A rface) ular to su (perpendic ˆ || n A r Examples: Examples: C N E 1000 = r 30° S 2 S 1 S 3 Find: flux through S 1 , S 2 , S 3 ....
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## This note was uploaded on 02/17/2011 for the course PHYSICS 1E03 taught by Professor Jopko during the Spring '08 term at McMaster University.

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lecture5 - Gauss’s Law •Electric Flux •Gauss’s Law...

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