In case of charging of series RC circuit having DC excitation, se
| In case of charging of series RC circuit having DC excitation, select the false one.
A. Charging current is a decaying function of time.
B. Time constant = R/C (R=resistance, C=capacitance)
C. During first time constant, the capacitor attains 63.2% of steady state voltage.
D. All of these
Please scroll down to see the correct answer and solution guide.
Right Answer is: B
SOLUTION
The equation of capacitor voltage is:
Charging current is a decaying function.
As the capacitor is getting charged, the charging current dies out. 
Time constant = RC
As, t/RC = 1
Or, t= RC
Voltage across the capacitor, Vc= V ( 1- 0.368) = 0.632V
Hence the voltage is 63.2%.
