Considering the same circuit, only with the switch thrown from b to a at time t = 0 after having been in position b for a long time. DATA: Vb = 12 V, C = 10 µF, R = 20 Ω. a.) What is the curnent through the resistor just BEFORE the switch is thrown? b.) What is the current through the resistor just AFTER the switch is thrown? c.) What is the charge across the capacitor just BEFORE the switch is thrown? d.) What is the charge on the capacitor just AFTER the switch is thrown? e.) What is the charge on the capacitor at at time t = 0.3 msec after the switch is thrown?

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.