1 / 21

Electric flux, Gauss’s law

Electric flux, Gauss’s law. Carl Friedrich Gauss. Physics 122. Concepts . Primary concepts: Electric flux. Laws . Gauss’s law. Definition of electric flux. Flux means flow Nothing is actually flowing Other than that thinking of flow really helps to understand the flux. Electric flux.

ryder
Download Presentation

Electric flux, Gauss’s law

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Electric flux, Gauss’s law Carl Friedrich Gauss Physics 122 Lecture IV

  2. Concepts • Primary concepts: • Electric flux Lecture IV

  3. Laws • Gauss’s law Lecture IV

  4. Definition of electric flux • Flux means flow • Nothing is actually flowing • Other than that thinking of flow really helps to understand the flux Lecture IV

  5. Electric flux • If electric field is rain – electric flux is the amount of water in a bucket accumulated per unit of time: • Only component of the field perpendicular to the area A contributes to the flux Lecture IV

  6. Electric flux • Alternatively we can define a vector A, which equals to the area A and is directed perpendicularly to the area Flux is proportional to the number of field lines going through the surface Lecture IV

  7. Compare fluxes Which flux is larger? 1). F1>F2 2). F1<F2 3).F1=F2 2 1 Lecture IV

  8. Compare fluxes Which flux is larger? 1). F1>F2 2). F1<F2 3).F1=F2 2 1 Lecture IV

  9. Compare fluxes Which flux is larger? 1). F1>F2 2). F1<F2 3).F1=F2 1 2 Lecture IV

  10. Compare fluxes Which flux is larger? 1). F1>F2 2). F1<F2 3).F1=F2 1 2 Lecture IV

  11. Compare fluxes Which flux is larger? 1). F1>F2 2). F1<F2 3).F1=F2 1 2 Lecture IV

  12. Compare fluxes Which flux is larger? 1). F1>F2 2). F1<F2 3).F1=F2 2 1 Lecture IV

  13. Non-uniform field, irregular surface • Closed surface • Influx <0 • Outflux>0 Don’t worry, we’ll only deal with simple surfaces Complex surfaces can be handled using numeric integration by a computer. Lecture IV

  14. Why do we need flux? • Gauss’s law: Lecture IV

  15. Gauss Coulomb • Calculate E of point like (+) charge Q • Consider sphere radius r centered at the charge • Spherical symmetry: E is the same everywhere on the sphere, perpendicular to the sphere Lecture IV

  16. Sinks and sources • What goes in – goes out • unless • there is a source (positive charge) • or a sink (negative charge) + - Lecture IV

  17. What’s the flux? • F1=? F2=? Lecture IV

  18. Respect the symmetry • Find electric field for the following configurations: • Uniformly charged sphere. Charge Q, radius R. • Long uniform line of charge. Charge per unit length l. • Infinite plane of charge. Charge per unit of area s Lecture IV

  19. Field near conductor • Infinite plane of charge. Charge per unit of area s • Field inside conductor is zero, outside perpendicular to the surface. Lecture IV

  20. Respect the symmetry • Find electric field for the following configurations: • Uniformly charged sphere. Charge Q, radius R. • Long uniform line of charge. Charge per unit length l. • Infinite plane of charge. Charge per unit of area s Lecture IV

  21. Two parallel plates • Infinite plates • One positive, one negative, • Same charge density s + - Lecture IV

More Related