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//Chapter 9, Example 9.2
clc
//Initialisation
L=400*10**-3 //inductance in henry
R=20 //resistance in ohm
V=15 //voltage
i=300*10**-3 //current in amp
e=2.7183 //exponent
//Calculation
T=L/R //time constant in sec
I=V/R //current in amp from Ohms Law
t=(log10(I/(I-i))/log10(e))*T //time period
//Results
printf("t = %.1f ms",t*1000)
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