Answer
$L = 10mH$
Work Step by Step
Given the two graphs we want to use the inductor equation $v = L* \frac{di}{dt} $
and find v and $\frac{di}{dt} $, to calculate inductance
from the graph, $V = 2V$
$\frac{di}{dt} = 1/(5*10^{-3}) = 200 A/s$
so $L = 2/(200) = 10mH$
