Problem set #1, EE 223, 1/16/2003 – 1/23/2003
Chapter 8, Problem 1.
After having been closed for a long time, the
switch in the circuit of Fig. 8.41 is opened at t = 0.
(a) Find iL(t) for t > 0.
(b) Evaluate iL(10 ms).
(c) Find t1 if iL(t1) =0.5iL(0).
Chapter 8, Problem 5.
The switch in the circuit of Fig. 8.45 is a single-
pole, double-throw switch that is drawn to indicate
that it closes one circuit before opening the other;
this type of switch is often referred to as a “make
before break” switch. Assuming the switch has
been in the position drawn in the figure for a long
time, determine the value of v and iL (a) the instant
just prior to the switch changing; (b) the instant
just after the switch changes.
Chapter 8, Problem 9.
Sketch the resistor voltage in a simple RL circuit characterized by an initial energy of 15 mJ stored in the 10-mH
inductor for R = 1 kΩ, R = 10 kΩ, and R =100 kΩ. Optional: Verify your solution with a single PSpice
simulation.
Chapter 8, Problem 11.
A digital signal is sent through a loosely coiled wire having an inductance of 125.7 µH. Determine the
maximum permitted value of the receiving equipment’s Thévenin equivalent resistance if transients must last
less than 100 ns (assume transients decay to zero after 5τ.)
Chapter 8, Problem 13.
(a) Find vC(t)for all time in the
circuit of Fig. 8.48.
(b) At what time is vC =0 1vc(0) ?