Consider two inductor circuits. Assume that the current is increasing with time equally in both the circuits.

The correct graph for energy stored in inductor with current is

$ \frac{di}{dt} = k$

$ I = kt$

We know,

Energy stored in an Inductor U = \(\frac{1}{2}\)Ll²

Thus U ∝ I² → quadratic function and U ∝ L

Hence, upward parabolic curve and