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# What is r-hat cross phi-hat in spherical coordinates?

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- 9 years agoFavorite Answer
r-hat cross phi-hat = theta-hat

r-hat is the unit vector in a direction in which only r changes and theta and phi remain constant

phi-hat is the unit vector in a direction in which only phi changes and theta and r remain constant, and

theta-hat is the unit vector in a direction in which only theta changes and r and phi remain constant.

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