Circulation of a Mag field around a wire, what is the angle?

[Sara Kennedy]

Circulation of a magnetic field = closed loop integral ∫_c B ⋅dl = μ₀I

B is mag field strength, dl is small line element, I is current

Im imagining both B and dl point in the same direction from the diagram. So the dot product here, I picture as cosθ = cos0

Is that correct way to think? This is not a homework question, I'm reading amperes law theory.

 

[cnh1995]

Im imagining both B and dl point in the same direction from the diagram. So the dot product here, I picture as cosθ = cos0

Is that correct way to think?

Yes.