Lecture%2019D - Physics 1B Lecture 19D e will skip Electric...

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Unformatted text preview: Physics 1B Lecture 19D e will skip Electric field due to continuous charge distributions. Electric Flux Flux is the amount of something that flows through a given area. Electric flux, E , measures the amount of electric field lines that pass through a given area. If I were to measure the flux originating from a given source (a bunch of charged objects) through a given surface, what would I have to take into account? How big the area of the surface is. How strong the electric field is. The angle between the area (surface) and the electric field. Electric Flux2 Electric Flux In order to better understand the angle between E and A, we define the direction of A by a normal to A. Electric flux will depend on , A, and (where is the ngle between E and the ormal to A). Electric Flux 1) We introduce a vector with a magnitude equal to the area, A, of the surface element, and its direction rthogonal to the orientation of the surface element. 2) The flux is calculated as a dot (scalar) product between the vector and the local electric field . A more rigourous definition of electric flux through a surface element. A r A r E r i i i i i E A E A E cos = = r r i i i E E A E r r = = Electric Flux How does our new (more mathematical) definition relates to the previous pictures? Electric flux will depend on E, A, and (where is the angle between E and the normal to A)....
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Lecture%2019D - Physics 1B Lecture 19D e will skip Electric...

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