PX275 - B1c - cylindrical polar representation

• consider a current-carrying wire, with the current, $I$, in the $+z$ direction
• at a point, $P$, at a distance, $\rho$, away from the wire, the magnetic field strength is: $B=\frac{{\mu }_{0}I}{2\pi \rho }$
• in cartesian system:

\1\n\2\n