E SSM The drawing shows three identical rods $($A$,$ B$,$ and C$)$ moving in different planes. A constant magnetic field of magnitude $0\mathrm{.}45T$ is directed along the $+y$ axis. The length of each rod is $L=1\mathrm{.}3m,$ and the rods each have the same speed, $v_A=v_B=v_C=2\mathrm{.}7\frac{m}{s}.$ For each rod, find the magnitude of the motional emf, and indicate which end $(1$ or $2)$ of the rod is positive.