1) We know that the time constant
here R=6.12*103 ohms , C=3.87*10-6 F
2) time taken by the capacitor to full charge
3) We know that for charging capacitor
Q=70Qo/100 =0.70Qo
put that value in equation 1
0.70Qo =Qo(1-e-t/RC)
0.70=1-e-t/RC
e-t/RC =0.3
take ln both side
t=-RC ln(0.3)
t=-0.0236844 ln(0.3)
t=0.02852 s
21. [3pt) An open switch, a 6,12 kohm resistor and a 3.87 microfarad capacitor are connected...
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