PHYS 1062 Lecture Notes - Lecture 3: Gaussian Surface, Electric Flux, Surface Charge
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23: electric flux (sections 23-1, 23-2, 23-3) - > review: scalar product of two vectors. - > electric flux: gauss" law (sections 23-4, 23-5) ----- = e. da = 4 kqenclosed by a gaussian surface. Applications: to calculate electric flux and electric field. a: example #1: a point charge b. Example #2 (many point charges -- several cases). c. example #3: electric field due to a conducting solid sphere or a thin spherical shell (charges on surface only) Conductor (metal): charge can move freely: if an excess charge is placed on a conductor, it will move to the surface of the conductor. Namely, none of the excess charge can stay within the body of the conductor: the electric field is zero within the body of the conductor. (i) inside sphere, (ii) outside sphere. Question 22-3: (a) yes, (b) toward, (c) no, (d) cancel, (e) add, (f) [see parts (d) and (e)], (g) y.
