What type of coordinate system?

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shanepitts
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This is a very basic question, but what type of coordinate system is this?

When is it useful to use?

er, eθ, eΦ sinθ
 
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Those notations are typically used for the so-called (curvilinear) spherical coordinate system. It's useful when the system to be described has a pronounced spherical symmetry, for example our Earth's magnetic field, electric field due to a charges sphere, and hydrogen atom. By the way what is that ##\sin\theta## for?
 
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