PHYS 1302W Lecture Notes - Lecture 1: Electric Field
Document Summary
A measure of how strong the electric field is over a surface q>0 in a box q<0 in a box. An electric field is not a flow (analogies to fluid flow can be helpful, but misleading) For a plane area a in a uniform field e, with area perpendicular to e. But if the area is tilted by an angle (fancy q) If e is non-uniform or the area is curved, consider the area as divided into tiny pieces and approximate da n piece by a planar rectangle. Charge q=+3. 0 microcolombs at the center of a sphere of radius 0. 20m. Find da is always outward for a closed surface. This has the same value for all locations on the sphere. If we move the charge a little for center in the sphere. The math gets more complicated but the result is the same. If we change the shape of the surface but keep q inside.
