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- Homework Statement
- So I know that SB · dl = u0I (sorry this is the only way that was working). But I was wondering what each part meant? Cause in Gauss's law, the SE · dA is the object that is being used to calculate electric field and in Ampere's, it is meant to be similar. So if we had a wire of radius a. This wire creates a uniform field. If we had to calculate the field at point b outside the wire, what would the equation look like? From what I have learned, we would use a circle for this. So B(2pi a) or B(2pi b)?

- Relevant Equations
- S B · dl = u0I

I believe it would be B(2pi b) but I'm not sure how exactly to explain why.