35.
(a) In region a of the graph,
|i
d
| = ε
0
dΦ
E
dt
= ε
0
A
dE
dt
=
(8.85
× 10
−12
F/m)(1.6 m
2
)
4.5
× 10
5
N/C
− 6.0 × 10
5
N/C
4.0
× 10
−6
s
= 0.71 A.
(b) i
d
∝ dE/dt = 0.
(c) In region c of the graph,
|i
d
| = ε
0
A
dE
dt
= (8.85 × 10
−12
F/m)(1.6 m
2
)
−4.0 × 10
5
N/C
15
× 10
−6
s
− 10 × 10
−6
s
= 1.1 A .