State Ampere's circuital law.

Explanation

Ampere's low : The line integral of magnetic field over a closed loop is `mu_(0)` times net current enclosed by loop.
`underset(C)ointvecB . vec(dl) = mu_(0) I_("enclosed") `
Where `I_("enclosed") ` the net current linked by the closed loop C. Note that the line integral does not depend on the shape of the path or the position of the conductor with the magnetic field .