The magnetic field is given by the contribution of the current  times the length of the incremental 
The magnetic field is given by the contribution of the current  times the length of the incremental parts of the wire divided by  the distance to the point in question times the speed of light  squared. For ten points, name this law, which is very useful for  caculating magnetic fields created by electric circuits.
The magnetic field is given by the contribution of the current  times the length of the incremental parts of the wire divided by  the distance to the point in question times the speed of light  squared.
{Biot-Savart} Law