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.

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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).