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+// Example 2.8:equation of current and time
+clc;
+close;
+clear;
+format('v',6)
+// given :
+v=100;//voltage in volts
+r=100;//resistance in ohms
+l=0.2;//inductance in henrty
+T=1/(l/r);//calculating time in seconds
+t=500;//time in micro seconds
+i1=1-exp(-T*t*10^-6);//current in amperes
+disp(i1,"current is (when t=500 micro seconds),(A)=")
+v2=50;//voltage in volts
+x=v2/r;//variab;e
+x1=x*((v2/r)+i1);//variable 
+t1=t+(10^6*(x1/500));//time in seconds
+disp(ceil(t1),"time at which current will be zero is,(micro-seconds)=")
+//time is caluclated wrong in the textbook as they had not added the values