![]() In a curvilinear coordinate system like spherical coordinates, the direction of the unit vectors varies from point to point, so the unit vector itex hat r /itex points in different directions at different places. ![]() Since virtually everything we do in this course deals with three dimensional space, it makes sense to start with a short discussion of how to represent a point in 3-D space. In a Cartesian coordinate system the unit vectors point in the same direction everywhere. ![]()
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