Solve the problem. If the switch is thrown open after the current in an RL circuit has built up to its steady-state value, the decaying current obeys the equation di + Ri = 0. How long after the switch is thrown open will it take the current to fail to 20% of its original vaiue?

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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).