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//Chapter 18, Problem 5
clc;
//Initializing the variables
C=10*10^-6; //capacitance in farad
R=25*10^3; //resistance in ohm
V=100; //voltage dc supply
t1=0.5; //time in seconds
t2=0.1; //time in seconds
vc1=45; //capacitor voltage
Vm=V;
//Calculation
taw=C*R; //time constant
Im=V/R; //maximum current
vc=Vm*(1-exp(-t1/taw)); //voltage across the capacitor
i=Im*exp(-taw/taw); //current flowing after one time constant
vr=V*exp(-t2/taw); //voltage across the resistor
t3=-(log(1-(vc1/Vm))/log(exp(1)))*taw; //time in seconds
vt=V/taw; //initial rate of voltage rise
printf("\n(a) Time constant = %f sec\n",taw);
printf("\n(b) Maximum current = %f mA\n",Im*10^3);
printf("\n(c) Voltage across the capacitor after 0.5 s = %f V\n",vc);
printf("\n(d) Current flowing after one time constant = %f mA\n",i*10^3);
printf("\n(e) Voltage across the resistor after 0.1 s = %f V\n",vr);
printf("\n(f) Time for the capacitor voltage to reach 45V = %f s\n",t3);
printf("\n(g) Initial rate of voltage rise = %f V\n",vt);
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