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// chapter 2 example 14
//------------------------------------------------------------------------------
clc;
clear;
// given data
f = 1000; // frequency in Hz
sigma = 5*10^7; // conductivity in mho/m
er = 1; // relative permitivity
eo = 8.85*10^-12; // permitivity
//J = 10^8sin(wt-444z)ax A/m^2
// Calculations
w = 2*%pi*f
// J = σE
// E = 10^8sin(wt-444z)ax/sigma
// E = 0.2sin(6280t-444z)ax
// D = eoerE
// D = 8.85*10^-12*0.2sin(6280t-444z)ax
// ∂D/∂t = 1.77*10^-12*6280cos(6280t - 444z)ax
A = 1.77*10^-12*6280
mprintf('Amplitude of displacement current density = %3.2e A/m^2',A);
mprintf('\n Note: calculation mistake in textbook');
//------------------------------------------------------------------------------
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