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//===========================================================================
//chapter 10 example 20
clc;clear all;
//variable declaration
V1 = 200; //voltage in V
V2 = 126; //voltage in V
t = 30; //time in seconds
V12 = 200; //voltage in V
V22 = 100; //voltage in V
//calculations
//let CR = a
//V2 = V1*e^(t/C*R)
a = t/log(V1/V2); //C*R
//R1 = (10*R)/(10+R)
a1 = t/log(V12/V22); //C*R1
//a1/a =R1/R=x
x = a1/a;
//since R1 = (10*R)/(10+R)
//x*(10+R)*R = 10*R
//(x*10)+R*x = 10
R = (10-(x*10))/x; //Resistance in Ω
//result
mprintf("resistance = %3.2f M Ω",R);
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