Physics - Magnetism Question with Solution | TestHub

Four very long straight wires carry equal electric currents in the$+z$-axis. They intersect the$x-y$plane at point$\left(x,y\right)=\left(-a,0\right),\left(0,a\right),\left(a,0\right)$and$\left(0,-a\right)$. The magnetic force exerted on the wire at position$\left(-a,0\right)$is along