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+//Chapter 18, Problem 12

+clc;

+//initializing the variables:

+L = 6;              //inductance in henry

+r = 10;             //resistance in ohms

+V = 120;            //supply voltage

+taw = 0.3;          //time constant

+t1 = 1;             // in secs

+

+//calculation:

+R = (L/taw) - r

+Rt = R + r

+I = V/Rt

+i2 = 0.1*I

+i1 = I*(%e^(-1*t1/taw))

+t2 = -1*taw*log((i2/I))

+

+printf("\n (a)Resistance of the coil = %.0f ohm\n\n",R)

+printf("\n (b)Current flowing in the circuit one second after the shorting link has been placed = %.3f A\n\n",i1)

+printf("\n (c)The time for the current to decay to 0.1 times of initial value = %.3f sec\n\n",t2)