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//===========================================================================
//chapter 5 example 30
clc;clear all;
//variable declaration
d = 0.08; //diameter in m
D = 0.004; //distance between plates in m
F = 0.002; //force in Newton
//calculations
e0 = 8.85*10^-12; //permittivity in N
A = (%pi/4)*(d^2); //area of the plates in m**2
x = (F*2*(D^2))/(e0*A);
V = sqrt(x); //potential diference in V
//result
mprintf("potential diference = %3.1f V",V);
mprintf("\nNote:final answer in textbook is wrong printed")
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