1. The time constant RC has a unit of     second/farad.     second/ohm.     1/second.     second/watt.     none of these   2. Four circuits have the form shown in the diagram below. The capacitor is initially uncharged and the switch S is open. Rank the circuits according to the current just after switch S is closed least to greatest. The values of the emf E, resistance R, and capacitance C for each of the circuits are (attached photo)

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