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+// Example 2.9 :time
+clc;
+close;
+format('v',6)
+clear;
+// given :
+v=10;//voltage in volts
+r1=500;//resistance in ohms
+is=0;//current in amperes
+r=700;//resistance in ohms
+c=100;//capacitance in micro farads
+x=1/(r*c*10^-6);//variable
+i=30;//current in mA
+y=(i*10^-3)-(v/r1);//variable
+t=-((log(y*(r/v))));//time in seconds
+t1=t/x;//time in seconds
+disp(t1,"time is ,(seconds)=")
+