The switch in the circuit has been closed for a long time. It is opened at t = 0. At t = 0+, the current through the 1 µF capacitor is 5 V= 1Ω w oto t = 0 1 µF: 4Ω

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Capacitor

The capacitor is an element used to store electrical energy in the electrical field. A capacitor is a form of passive energy.