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//===========================================================================
//chapter 10 example 21
clc;clear all;
//variable declaration
V1 = 450; //voltage in V
V2 = 280; //voltage in V
t = 15.2; //time in minutes
t1 = 10.8; //time in minutes
C = 2.5*10^-6; //capacitance in F
//calculations
t12 = t*60; //time in seconds
t22 = t1*60; //time in seconds
//V2 = V1*e^(t/C*R)
x = V1/V2;
y = log(x);
R = t12/(C*y);
R1 =t22/(C*y);
//R1 = t1/(C*log(V1/V2));
//1/R` = (1/R1)-(1/R)
R11 = (R1*R)/(R-R1); //unknown resistance in Ω
//result
mprintf("unknown resistance= %3.2d M Ω",(R11*10^-6));
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