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## Homework Statement

Ampere's Law states [tex]

\int _C \vec{B} \cdot \vec{dr} = \mu_0 \ I

[/tex] .

By taking C to be a circle with radius r, show that the magnitude B = |

**B**| of the magnetic field at a distance r from the center of the wire is [tex]

B = \frac{\mu_0}{2 \pi} \ \frac{I}{r}

[/tex]

## The Attempt at a Solution

I really don't know where to start. I don't know what the components of B are, so I don't know how I'm supposed to compute this integral.

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