Reading:

Cutnell and Johnson, Chapter 23 (excluding section 23.5); Chapter 20 sections 20.5 and 20.13.

Problems for Review:

Reviewing these problems gives you good exposure to this week's main topics, in practice. All are worked in the Student Study Guide [SSG] or Student Solutions Manual [SSM]; solutions are posted on our website http://www.physics.emory.edu/Classes/142-003.html , for those without these texts.

Conceptual:

MCAT review problem, [SSG] p 452. NOTE: The passage here is a little misleading. Note that opposite plates of the capacitor always carry equal and opposite charge; transferring all the negative charge from the bottom to the top plate leaves the top neutral, not negative.

Quantitative:

Chapter 20, problem 101.
Chapter 23, problems 5, 9, 13, 21, 29, 33, 37, 45.

Problems to Hand In:

Conceptual:

Questions 1 through 10 refer to the situation below:

1. What is the marked time ?
   1. 0.16 s
   2. 0.14 s
   3. 0.12 s
   4. 0.08 s
   5. 0.025 s
2. Determine the rms voltage across the generator.
   1. 49.5 V
   2. 70.0 V
   3. 112 V
   4. 140 V
   5. 170 V
3. What is the reactance of the circuit element connected to the generator?
   1. 20
   2. 25
   3. 30
   4. 35
   5. 40
4. Which of the following is a valid phasor plot of the current and voltage across the circuit element, at some specific moment in time?

   

5. Identify the circuit element.
   1. a 25 resistor.
   2. a 35 resistor.
   3. a 0.45 H inductor.
   4. a 360 capacitor.
   5. a 510 capacitor.

   
   

   

   
   

6. What is the reactance of the entire load (containing both elements) connected to the generator?
   1. 30
   2. 35
   3. 40
   4. 50
   5. 70
7. What circuit element was added to the circuit to produce this reactance?
   1. a resistanceless wire.
   2. a 0.45 H inductor.
   3. a 0.89 H inductor.
   4. a 360 capacitor.
   5. a 720 capacitor.
8. Which of the following is a valid phasor plot of the current and voltage across both circuit elements (initial = 1, added = 2), at some specific moment in time?

   

9. What is the average power supplied to this circuit?
   1. none
   2. 280 W
   3. 140 W
   4. 100 W
   5. 70 W
10. What is the resonant frequency of this circuit?
    1. radians/sec
    2. Hz
    3. 60 Hz
    4. 60 radians/sec
    5. 3000 Hz

Quantitative:

Chapter 20, problem 102.
Chapter 23, problems 14, 24, 27, 32, 46, 47.

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