lec03_ddn

# lec03_ddn - Gauss Law What are in the boxes*relates the...

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8/28/11 1 Gauss’ Law *relates the electric fields at points on a closed Gaussian surface and the net charge enclosed by that surface. What are in the boxes?

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8/28/11 2 Concept of Flux θ v Air stream with uniform velocity, v , flows through a loop of area A Φ = volume time can define a flux:
8/28/11 3 Flux of an Electric Field Need to quantify the pattern. More lines comes from the box – more charge inside! Q: How many lines cross the surface?

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8/28/11 4 Flux of an Electric Field Analogy : think of rain which falls into a bucket. Less rainwater enters the bucket if it is tilted A E EA EA = = θ cos ~ lines of number The number of lines crossing a surface is proportional to the perpendicular component of the field.
8/28/11 5 Electric field flux Field lines can either enter the closed surface area, or exit it. Flux sign is consistent with the sign of the enclosed net charge. Definition of electric field flux: θ cos EA A E EA E = = = Φ

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8/28/11 6 Example: Flux through a Cube
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lec03_ddn - Gauss Law What are in the boxes*relates the...

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