2.

The switch in the circuit shown

has

been in position a for a long time. At t = 0, the

switch is moved to position b, where it remains for

1 ms. The switch is then moved to position c, where 20A (1) 40 №

it remains indefinitely. Find

a) i(0¹).

b) i(200 µs).

c) i(6 ms).

d) v(1¯ms).

e) v(1¹ ms).

The capacitor in the circuit

has

been charged to 300 V. At t = 0, switch 1 closes,

causing the capacitor to discharge into the resistive

network. Switch 2 closes 200 μs after switch 1

closes. Find the magnitude and direction of the cur-

rent in the second switch 300 µs after switch 1

closes.

+

300 V

120 Ω

60 Ω 3

40 Ω

t=0

30 ΚΩ

60 ΚΩ

외국

10

nF

t=200ms

120 ΚΩ

40 ΚΩ

v80 mH