The document contains several questions related to circuit analysis: 1) The first question asks to calculate the rate of change of current (di1/dt) and (di2/dt) in a circuit when a switch is closed at time t=0, with the given options being 16.67 A/sec and -4.16x10^4 A/sec or 16.67 A/sec and -3.33x10^4 A/sec. 2) The second question asks to calculate the extreme time constant limits of a circuit with given resistor values of R1=1.5MΩ and 0<R2<2.5MΩ. It also asks how

1. Q.) For a network shown in figure, a steady state is reached with switch k is
open. Switch is closed at time t = 0. Calculate (di1/dt ) and (di2/dt) at t = 0+
(a) 16.67 A/sec and –4.16 ×104 A/sec
(b) 16.67 A/sec and –3.33 ×104 A/sec
(c) 25 A/sec and –4.16 ×104 A/sec
(d) 25 A/sec and –3.33 ×104 A/sec

2. Q.) Consider the circuit in Figure, and assume that R1 = 1.5 MΩ, 0 < R2< 2.5
MΩ.
(a) Calculate the extreme limits of the time constant of the circuit.
(b) How long does it take for the lamp to glow for the first time after the switch is
closed?
Let R2 assume its largest value.

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15. Q.) The initial charge in the 1 F capacitor present in the circuit shown is zero.
The energy in joules transferred from the DC source until steady state condition is
reached equals _________.

16. Q.) For a network shown in figure, a steady state is reached with switch k is
open. Switch is closed at time t = 0. Calculate (di1/dt ) and (di2/dt) at t = 0+
(a) 16.67 A/sec and –4.16 ×104 A/sec
(b) 16.67 A/sec and –3.33 ×104 A/sec
(c) 25 A/sec and –4.16 ×104 A/sec
(d) 25 A/sec and –3.33 ×104 A/sec

19. Q.) In the circuit given below, the switch is open for a long time. At time t = 0,
the switch is closed. What are the initial and final values of voltages across the
inductor ?
(a) 0 V and 0 V
(b) 0 V and 8 V
(c) 80 V and 0 V
(d) 80 V and 80 V

21. Q.) The switch changes in the given circuit. Determine v(t) at t=0 and at t = 160
μsec.

23. Q.) The switch in the figure below was closed for long time. It is opened at t = 0.
The current in the inductor of 2 H for t > 0, is

25. Q.) Consider the circuit in Figure, and assume that R1 = 1.5 MΩ, 0 < R2< 2.5
MΩ.
(a) Calculate the extreme limits of the time constant of the circuit.
(b) How long does it take for the lamp to glow for the first time after the switch is
closed?
Let R2 assume its largest value.