DQ3A_solution - Discussion Question 3A P212, Week 3...

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Discussion Question 3A P212, Week 3 Electric Flux 1 Electric Flux refers to the net amount of electric field flowing through a surface. A way to write this is: flux, E dA Φ≡ G G . Why do we care about flux? Because Gauss’ law states that flux = 0 enc Q EdA ε ⋅= G G , which gives us an easy way to calculate electric fields for charge distributions. So, as first step, let’s see how to find E dA G G , or the net flux, through some surfaces … [Remember that you care about net flow through a surface, which is the difference between flow in and flow out] (a) An infinitely thin imaginary plane (a “Gaussian surface”) is placed in a uniform electric field as shown. Is there a net flux through the plane? There is a net flux. Would there be a net flux if the plane were rotated 90º through an axis perpendicular to the plane of paper? If the plane were rotated 90º, there would be no net flux through the plane.
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This note was uploaded on 06/16/2011 for the course PHYS 212 taught by Professor Kim during the Spring '08 term at University of Illinois, Urbana Champaign.

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DQ3A_solution - Discussion Question 3A P212, Week 3...

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