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- PHY102 Physics II © Dr.Cem Özdoğan
- Example, Flux through a closed cube, nonuniform field:
- Right face: An area vector A is always perpendicular to its surface and always points away from the interior of a Gaussian surface. Thus, the vector dA for any area element on the right face of the cube must point in the positive direction of the x axis. The most convenient way to express the vector is in unit-vector notation,
- Although x is certainly a variable as we move left to right across the figure, because the right face is perpendicular to the x axis, every point on the face has the same x coordinate. (The y and z coordinates do not matter in our integral.) Thus, we have