4. Assume that the switch in the circuit has been in the close position for a long time and at t = O it is opened. Write the expressions for v1(t) and v2(t) for t 2 0. ww 20 10 12 V 2F* ) 203 18V

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A: for t &lt;0 I = 1515+20+40I=0.2 mAV1(0) = 20 K ×0.LmA         = 4VV2(0-) = 40×0.2            = 8V

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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).