Problem $2$ Two square loops of side $\backslash ($ a $\backslash )$ each carry a current $\backslash ($ I $\backslash )$ and are oriented such that their areas are directed in the $\backslash (\backslash$hat$\{$y$\}\backslash )$ and $\backslash (\backslash$hat$\{$z$\}\backslash )$ directions, respectively. Assume the currents flow in a counter$-$clockwise direction about each loop's normal. If the centers of the loops are separated by a distance $\backslash ($ d $\backslash ),$ what is the torque on the first loop due to the second loop?