(Solved): Figure 1 Long wires. In Fig.2, four very long identical straight wires are arranged as shown with X ...

Figure 1 Long wires. In Fig.2, four very long identical straight wires are arranged as shown with $X_1=0.25$ $\mathrm{m},X_2=1.00\mathrm{m}$ and $X_3=0.50\mathrm{m}$. The directions of the flowing current in each wire are also shown, with $I_1=3.0\mathrm{A},I_2=4.0\mathrm{A},I_3=8.0\mathrm{A}$ and $I_4=6.0\mathrm{A}$. (a) Find the magnitude and direction of the magnetic field (in Tesla) produced by current $I_1$ at a point midway between wires with currents $I_2$ and $I_3$. (b) Find the magnitude and direction of the resultant magnetic field (in Tesla) at a point midway between wires with currents $I_2$ and $I_3$. (c) Find the magnitude and direction of the resultant magnetic force per unit length (in $\mathrm{N}/\mathrm{m}$ ) on the wire with current $I_2$.