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Homework 2 Answers Back Question 1 (1 point) Question 2-1a What is the formula for the impedance of a capacitor in complex form? Student response: Percent Value Correct Response Student Response Answer Choices 100.0% a. Z C = 1/j C 0.0% b. Z C = j C 0.0% c. Z C = C + j 0.0% d. Z C = C - j General feedback: The impedance of capacitors and inductors can be expressed very simply in complex nota the class notes for details or read about Capacitive and Inductive Impedance in this section http://www.phys.ualberta.ca/~gingrich/phys395/notes/node29.html#SECTION003300000 Score: 1 / 1 Question 2 (1 point) Question 2-1b What is the formula for the impedance of an inductor in complex form? Student response: Percent Value Correct Response Student Response Answer Choices 100.0% 0.0% 0.0% 0.0% General feedback: The impedance of capacitors and inductors can be expressed very simply in complex nota the class notes for detailsor read about Capacitive and Inductive Impedance in this section http://www.phys.ualberta.ca/~gingrich/phys395/notes/node29.html#SECTION003300000 Score: 1 / 1 Question 3 (1 point)

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Question 2-2a In the circuit below, calculate the maximum current in R1, at very high frequencies, if R1=3K ohms, R2=4K microfarads and VSIN has an amplitude of 13volts. Express your answer in milliamps. Hint: Remember the b capacitors at high frequencies. Student response: 4.333 Correct answer: 4.33333 General feedback: If a resistor is in parallel with a short, all the current flows through the short, no current flo the resistor, and it may as well not be in the circuit at all. If a resistor is in parallel with an all the current will flow through the resistor, and the open circuit may as well not be there Score: 1 / 1 Question 4 (1 point) Question 2-2b In the circuit below, calculate the maximum current in R1, at very low frequencies, if R1=5K ohms, R2=3K o microfarads and VSIN has an amplitude of 14volts. Express your answer in milliamps. Hint: Remember the b capacitors at low frequencies.
Student response: 1.75 Correct answer: 1.75000 General feedback: If a resistor is in parallel with a short, all the current flows through the short, no current flo the resistor, and it may as well not be in the circuit at all. If a resistor is in parallel with an all the current will flow through the resistor, and the open circuit may as well not be there Score: 1 / 1 Question 5 (1 point) Question 2-3a In the circuit below, calculate the amplitude of the voltage across R1 if R1=2K ohms, R2=3K ohms, R3=692 the amplitude of VSIN is 15volts. Express your answer in volts. Student response: 5.27 Correct answer: 5.27056 General feedback: Although this is an AC question, you can use the DC rules for combining circuits to find t amplitude given the input amplitude. Note that amplitudes can never be negative. Also no voltage divider rule can only be applied to a series circuit, so any parallel components mu combined.

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