How is the maximum value of alternating current EM = NBS ω derived?

How is the maximum value of alternating current EM = NBS ω derived?

As shown in the figure: the magnetic field direction is perpendicular to the paper surface (not shown in the figure), the magnetic induction intensity is B.N turns, the rectangular coil rotates uniformly around the axis perpendicular to the magnetic field, the angular velocity is ω, and the coil area is s. then, starting from the position shown in the figure, the induced electromotive force generated by cutting the magnetic induction line at side AB at time t is: e = nbl1 * V * sin ω T, where V = ω *