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//===========================================================================
//chapter 5 example 31
clc;
clear all;
//variable declaration
d = 0.1; //diameter in m
F = 0.005; //force in Newton
V = 10000; //potential diference in V
e0 = 8.85*10^-12; //permittivity in N
d2 = 26.4*10^-3; //distance between plates in mm
d1 = 25.4*10^-3; //distance between plates in mm
//calculations
A = (%pi/4)*(d^2); //area of the plates in m**2
x = sqrt((e0*A)/(2*F));
d2 = x*V; //distance between plates in mm
//C = e0*A/d
x1 = 1/d1;
x2 = 1/d2;
C = e0*A*(x1-x2); //change in capacitance in uF
//result
mprintf("change in capacitance due to change in distance between plates from 26.4 to 25.4 mm = %3.2f u uF",(C*10^12));
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