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[1]A resistor with R= \bigomega and a capacitor are connected in series. Then, a V0= Volt potential different is suddenly applied across them. The potential difference across the capacitor rises to V= Volts in t= \mu s . Calculate the time constant of the circuit and the capacitance of the capacitor.

[2]A capacitor with an initial potential difference of V0= Volt is discharged through a resistor when a switch between them is closed at t=0. At t= seconds the potential difference across the capacitor is V= Volts . That is the potential difference across the capacitor in t1= seconds ?