Problem 4 In the circuit to the right, & = 1.2kV, C = 6.5 µF, and R₁ = R₂ = R3 = R = 0.73 MN. With C completely uncharged, switch S is sud- denly closed at t = 0. Remember to draw equivalent circuits to help with the analysis! 2 R₁₂ - fε S Ro www R₂ (a) At t = 0, what is the voltage across the capacitor? How are the voltages across R3 and R₂ related? (b) At t= 0, what are the currents in each resistor? (c) For t→∞o, what are the currents in each resistor? (d) For t→ ∞o, what are the voltages across each resistor? (e) For t → ∞, what is the voltage across the capacitor? (f) Once the circuit has nearly reached equilibrium, the switch is reopened. What is the current in each resistor right after the switch is reopened? The equivalent circuit will be super useful here; note that when we change the circuit by opening the switch, the capacitor is no longer in steady state - do not assume its current is zero! (g) How long after the switch is reopened does it take for the current in Re to drop to half of the

Problem 4 In the circuit to the right, & = 1.2kV, C = 6.5 µF, and R₁ = R₂ = R3 = R = 0.73 MN. With C completely uncharged, switch S is sud- denly closed at t = 0. Remember to draw equivalent circuits to help with the analysis! 2 R₁₂ - fε S Ro www R₂ (a) At t = 0, what is the voltage across the capacitor? How are the voltages across R3 and R₂ related? (b) At t= 0, what are the currents in each resistor? (c) For t→∞o, what are the currents in each resistor? (d) For t→ ∞o, what are the voltages across each resistor? (e) For t → ∞, what is the voltage across the capacitor? (f) Once the circuit has nearly reached equilibrium, the switch is reopened. What is the current in each resistor right after the switch is reopened? The equivalent circuit will be super useful here; note that when we change the circuit by opening the switch, the capacitor is no longer in steady state - do not assume its current is zero! (g) How long after the switch is reopened does it take for the current in Re to drop to half of the

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 84CP: In this chapter, most examples and problems involved direct current (DC). DC circuits have the...

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