Q.The current i flowing in a coil varies with time as shown in the figure (a trapezoidal current-time graph: the source text shows the graph only as a figure, with the current rising, staying level, and falling between the marked time instants T/4, T/2, 3T/4 and T, without any numeric axis values given in the extracted text). The variation of induced emf with time would be one of four candidate emf-versus-time graphs labelled (a), (b),