The current i in a coil varies with time as shown in the

The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be

e = - L =	di
	dt

During 0 to	T	,	di	= const.
	4		dt

&htere4; e = - ve

During	T	to	T	,	di	= 0
	4		2		dt

&htere4; e = 0

During	T	to	3T	,	di	= const.
	2		4		dt

&htere4; e = +ve
Thus graph given in option (a) represents the variation of induced emf with time.