Fields and Conductors Actually make sense.

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Presentation transcript:

Fields and Conductors Actually make sense

Electrostatic Equilibrium Requires no field inside a conductor. Unbalanced charges at conductor’s surface. External field perpendicular to conductor surface

Internal charge +q

Internal charge +q

Hollow conductor +q

Hollow conductor Inside: field from point charge +q +q –q Between: zero field Outside: field from point charge +q

Electric Flux FE Conceptually, the number of electric field lines passing through a surface E FE = EA A = area of the surface

Electric Flux FE Previous formula only works when field is normal to the surface E FE = 0

Electric Flux FE E q Area in profile is A cos q q = angle of E field from surface normal FE = EA cos q

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