Problem 25-1    Source:   Exercise 8.7 - page 190 - NILSSON, James W. & RIEDEL, Susan A. - Book: Circuitos Elétricos - Editora LTC - 5ª edição - 1999.

In the circuit shown in the Figura 25-01.1, the switch S has been in position 1 for a long time. At t = 0 the switch is shifted to the position 2. Determine:

a) i (0⁺)

b) v_C(0⁺)

c) d i(0⁺) / d t

d) the roots of the characteristic equation that describes the transient behavior of the circuit.

Problem 25-2    Source:    Continued Exercise 8.7 and Exercise 8.8 - page 190 - NILSSON, James W. & RIEDEL, Susan A. - Book: Circuitos Elétricos - Editora LTC - 5ª edição - 1999.

In the circuit shown in the Figura 25-02.1, the switch S has been in position 1 for a long time. At t = 0 the key is shifted to the position 2. Determine:

a) i(t) to t ≥ 0

b) v_C(t) to t ≥ 0

Attention -In the source book (Nilsson & Riedel), on page 189, there is a typo error in equation 8.60, where the minus sign of α was omitted in the first part of the equation .

Problem 25-3    Source:    Problem 8.47 - page 332 - NILSSON, James W. & RIEDEL, Susan A. - Book: Circuitos Elétricos - Editora LTC - 10ª edition - 2016.

In the circuit shown in Figure 25-03.1 below, the switch was in the closed position for a long time. At t = 0 the switch is opened. Determine V_o (t) for t ≥ 0.