The switch in the circuit in Fig. P 7.21Ohas been in the left position for a long time. A t= 0 it moves to the right position and stays there. Figure P7.21 10 k2 5 kN 150 V 40 nF 30 kfN 360 kN a. Find the initial voltage drop across the capacitor. b. Find the initial energy stored by the capacitor. c. Find the time constant of this circuit for t > 0. d. Write the expression for the capacitor voltage v(t) for t > 0.

The switch in the circuit in Fig. P 7.21Ohas been in the left position for a long time. A t= 0 it moves to the right position and stays there. Figure P7.21 10 k2 5 kN 150 V 40 nF 30 kfN 360 kN a. Find the initial voltage drop across the capacitor. b. Find the initial energy stored by the capacitor. c. Find the time constant of this circuit for t > 0. d. Write the expression for the capacitor voltage v(t) for t > 0.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Sinusoids And Phasors

Sinusoids are defined as the mathematical waveforms that are used to describe the nature of periodic oscillations.

Circuit Theory

Electric circuits are a network that comprises of a closed-loop, which helps in providing a return path for the current through a switch. When the switch is activated, the load operates, and the current accepts a path to finish the circuit at a low potential level from the opposing high potential level. Electric circuits theory is a linear analysis that helps in establishing a linear relation of voltage and current for R (resistance), L (inductance), and C (capacitance).

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The switch in the circuit in Fig. P 7.21ohas been in the left position for a long time. At
t= 0 it moves to the right position and stays there.
Figure P7.21
10 k2
5 kN
150 V
40 nF
30 kfN 360 kN
a. Find the initial voltage drop across the capacitor.
b. Find the initial energy stored by the capacitor.
c. Find the time constant of this circuit for t > 0.
d. Write the expression for the capacitor voltage v(t) for t > 0.

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