(6 16),
d
d
d
d
W
I
L I
t
t
=
Total amount of work done in establishing the current I is
W
W
L I
I
I
=
=
∫
∫
d
d
0
Thus, the energy required to build up the current I is,
2
21
W
LI
=
(6 17)
This expression reminds us of mv 2/2 for the (mechanical) kinetic energy
of a particle of mass m, and shows that L is analogous to m (i e