The current (I) in the inductance is varying with time according

The current (I) in the inductance is varying with time according to the plot shown in figure.

Which one of the following is the correct variation of voltage with time in the coil?

V = - L	di
	dt

Here	di	is +ve
	dt

for	T	time and
	2

di	is -ve
dt

for next	T	time so
	2