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## Summary:

- in cylinder coordinates, I am trying to understand but without a succes why symmetric magnetic field around ##Z## axis make that ##\hat \phi## magnetic field is zero

I am trying to understand but without a succes why symmetric magnetic field around ##Z## axis make that ##\hat \phi## magnetic field is zero

I can't understand why it physically happens and also how can I derive it mathematically?

What does the word

I can't understand why it physically happens and also how can I derive it mathematically?

What does the word

**symmetric**means when talking about magnetic field?