Three long straight parallel wires are located in a Cartesian coordinate system so that all three wires are parallel to the z$-$axis. Wire $1$ has a current i$1=316$ mA in the positive z$-$direction and crosses the x$-$y$$plane at the coordinate $(0,8\mathrm{.}89)$ cm$.$Wire $2$ has a current i$2=405$ mA in the negative z$-$direction and crosses the x$-$y$$plane at the coordinate $(3\mathrm{.}48,0)$ cm$.$Wire $3$ has a current i$3=307$ mA in the positive z$-$direction and crosses the x$-$y$$plane at the coordinate $(-7\mathrm{.}17,-6\mathrm{.}48)$ cm$.$