The correct answer is: D. R-L-C circuit.
A double energy transient occurs in an R-L-C circuit when the current through the inductor and the voltage across the capacitor are both maximum. This occurs when the switch in the circuit is closed, and the current begins to flow through the inductor. The inductor stores energy in its magnetic field, and the capacitor stores energy in its electric field. As the current flows through the inductor, it creates a magnetic field that opposes the current. This causes the current to decrease, and the energy stored in the magnetic field is transferred to the capacitor. The capacitor then stores this energy in its electric field. As the voltage across the capacitor increases, it creates an electric field that opposes the voltage. This causes the voltage to decrease, and the energy stored in the electric field is transferred back to the inductor. The inductor then stores this energy in its magnetic field. This process continues until the current
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