PHYS 3410 Electronics, Dr. Sohl
Homework #2, 50 pts.
Do your w ork on a sep arate sheet o f paper. Circ le your answers . You must show your work to get credit. Fact of Life: If you
write like a slob, people (like your future bosses) will think you are a slob. (Selected answers are given in [ ] brackets.)
1. (4 pts) Determine the reactance for a 0.1 ìF capacitor when connected to ac voltage with a
frequency of (a) 60 Hz, (b) 1.0 kHz.
2. (4 pts) Determine the reactance for a 180 ìH inductor when connected to ac voltage with a
frequency of (a) 60 Hz, (b) 1.0 kHz.
3. (3 pts) Determine the time constant for a 12V DC circuit that is charging a 470 ìF capacitor in
series with a 10 k resistor.
4. (3 pts) Determine the time constant for a 12V DC circuit that
is forcing current through a 3.5 mH inductor in series with a
680 Ù resistor.
For problems 5 & 6, express complex results in exponential form.
5. (12 pts) Analyze the circuit shown on the right.
(a) Determine the complex current out of the supply.
OUT
(b) Determine the complex voltage out, V.
OUT
(c) What is the phase shift of V relative to V1? [-41.5E]
(d) Is this a high pass or low pass filter? What is the cuttoff
frequency? [1100 Hz]
6. (12 pts) Analyze the circuit shown on the right.
(a) Determine the complex current out of the supply.
OUT
(b) Determine the complex voltage out, V.
OUT
(c) What is the phase shift of V relative to V1? [48.5E]
(d) Is this a high pass or low pass filter? What is the cutoff
frequency? [1100 Hz]
7. (12 pts) Analyze the RLC circuit shown below. All phases are relative to the input voltage.
(a) Determine the complex voltage amplitude and phase across the inductor. [76.7V, 165.3E]
(b) Determine the complex voltage amplitude and phase across the capacitor. [88.3V, -14.7E]
(c) Determine the complex voltage amplitude and phase across the resistor. [3.1V, 75.3E]
(d) At a given instant of time (use t=0 for ease) what is the sum of the real voltages across the
three components?
Note that there are more problems on the next page...
