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#### skatenerd

##### Active member

- Oct 3, 2012

- 114

Well I just got like half the problems wrong on our first homework to use spherical coordinates in E&M, because I didn't realize the author does it the other way around. While I'm a little frustrated, I'm mostly just looking to see what you all think is the most accepted version.

Is it more common/valid to use theta as the angle in the xy-plane or as the angle from the xy-plane to the z-axis? I feel like it makes more sense to me to have theta as the angle in the xy-plane because when I first learned polar coordinates in 2 dimensions, it was r and theta, and we were always working in the xy-plane.

Anyways, let me know what you guys think.