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+//Chapter 18, Problem 3

+clc;

+//initializing the variables:

+C = 20E-6;                      //capacitance in farads

+R = 50000;                      //resistance in ohms

+V = 20;                         //supply voltage

+t1 = 1;                         // in secs

+t2 = 2;                         // in secs

+VRt = 15;                       // in volts

+

+//calculation:

+taw = R*C

+I = V/R

+Vct1 = V*(1-%e^(-1*t2/taw))

+t3 = -1*taw*log(VRt/V)

+it1 = I*%e^(-1*t1/taw)

+

+

+printf("\n (a)Initial value of the current flowing = %.4f mA\n\n",I*10^3)

+printf("\n (b)Time constant of the circuit = %.0f sec\n\n",taw)

+printf("\n (c)The value of the current one second after connection = %.3f mA\n\n",(it1/1E-3))

+printf("\n (d)The value of the capacitor voltage two seconds after connection = %.2f V\n\n",Vct1)

+printf("\n (e)The time after connection when the resistor voltage is 15 V = %.3f sec\n\n",t3)