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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)
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