Two identical coils, each having 400 turns and area 150cm2, are mounted on the same shaft with their planes perpendicular to each other. The assembly rotates at 1800rpm in a uniform magnetic field of 0.25T. If the coils are connected in series, what is the maximum (peak) emf that can appear across the combination?
(a) 565V
(b) 283V
(c) 400V
(d) 200V