m$3\mathrm{.}2$ Mesh$-$Current Method: Apply the mesh$-$current method to determine mesh currents $I_1$ to $I_4$ in the circuit of Fig. m$3\mathrm{.}2.$ From these results determine $V_1,$ the voltage across the current source. Use these component values: $I_{src1}=12\mathrm{.}5mA,V_{src}=15V,R_1=5\mathrm{.}6k,R_2=2\mathrm{.}2k,R_3=3\mathrm{.}3k,$ and $R_4=4\mathrm{.}7k.$