## Gauss's Law |

The CRUX OF ITS APPLICATION is the choice of ** gaussian surface**.
Keep in mind that this is not a surface of the charge distribution itself, but rather an imaginary surface constructed for application of Gauss's law.

To make Gauss's law tractable:

- All sections of the gaussian surface should be chosen so that they are either parallel or perpendicular to
**E**. For this we need to have already determined the direction of**E**everywhere on the surface by symmetry arguments. - |
**E**| should be constant on each surface. Again, this requires sufficient symmetry to "see" the constancy of field strength.

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Last updated Sept. 24, 1997.

Copyright George Watson, Univ. of Delaware, 1997.