Assignment 11

Assignment 11 - Class PEP112S2007 Assignment 11 Assignment...

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Class PEP112S2007 Assignment 11 Assignment is due at 11:00pm on Sunday, April 15, 2007 Credit for problems submitted late will decrease to 0% over the course of 10 hour(s) after the deadline has passed. The wrong answer penalty is 1% per part. Multiple choice questions are penalized as described in the online help. The unopened hint bonus is 1% per part. You are allowed 10 attempts per answer. Problem 33.15 Part A What is the potential difference across a 12.0 inductor if the current through the inductor drops from 120 to 60.0 in 14.0 ? ANSWER: 51.4 V Part B What is the direction of this potential difference? That is, does the potential increase or decrease along the direction of the current? ANSWER: increase decrease Problem 33.18
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A 2.0 mH inductor is connected in parallel with a variable capacitor. The capacitor can be varied from 100 pF to 200 pF. Part A What is the minimum oscillation frequency for this circuit? ANSWER: Hz Part B What is the maximum oscillation frequency for this circuit? ANSWER: Hz Power in a Decaying R-L Circuit Consider an R-L circuit with a DC voltage source, as shown in the figure . This circuit has a current when . At the switch is thrown removing the DC voltage source from the circuit. The current decays to at time . Part A
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What is the power, , flowing into the resistor, , at time ? Part A.1 Ohm's Law Part not displayed Part A.2 Power Dissipated Part not displayed Express your answer in terms of and . ANSWER: = Part B What is the power flowing into the inductor? Part B.1 Energy in an Inductor Part not displayed Part B.2 Equation for Part not displayed Hint B.3 Power into the Inductor Hint not displayed Express your answer as a function of and . ANSWER: = Part C
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Compare the two equations for power dissipated within the resistor and inductor. Which of the following conclusions about the shift of energy within the circuit can be made? ANSWER: Power comes out of the inductor and is dissipated by the resistor Power is dissipated by both the inductor and the resistor Power comes out of both the inductor and the resistor Power comes out of the resistor and is dissipated by the inductor The difference in sign between the power dissipated by the inductor and that by the resistor tells us that one is providing the power which is dissipated by the other. The inductor provides power from its magnetic field which is subsequently dissipated within the resistor as heat for example. Oscillations in an LC circuit. Learning Goal: To understand the processes in a series circuit containing only an inductor and a capacitor. Consider the circuit shown in the figure. This circuit contains a capacitor of capacitance and an inductor of inductance . The resistance of all wires is considered negligible. Initially, the switch is open, and the capacitor has a charge
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Assignment 11 - Class PEP112S2007 Assignment 11 Assignment...

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