A resistor and capacitor are connected in series. The resistor has   a resistance of 20-MΩ, the capacitor has a capacitance of 2.0-µF,   and they are connected to a 12-V battery. Before the switch is   closed, the capacitor is uncharged.  (a) What is the maximum current through the resistor?  (b) What will be the maximum charge on the capacitor?  (c) Calculate for the time constant.  (d) What fraction of charge is stored on the plates at time t = 30 s?  (e) What fraction of charge is stored on the plates at time t = 100 s

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