A certain series circuit consists of a 12-V battery, a switch, a 1.0- M resistor, and a

A certain series circuit consists of a 12-V battery, a switch, a 1.0- MΩ resistor, and a 2.0-μF capacitor, initially uncharged. If the switch is now closed, find 

(a) The initial current in the circuit, 

(b) The time for the current to drop to 0.37 of its initial value, 

(c) The charge on the capacitor then, and 

(d) The final charge on the capacitor.