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+// chapter 2 example 8
+//------------------------------------------------------------------------------
+clc;
+clear;
+
+//        | ax      ay                az            |
+// v*E =  | ∂/∂x   ∂/∂y             ∂/∂z           | 
+//        | 0       0  80*cos(6.277*10^8t - 2.092y) |
+// Electric flux density D =  εoE
+//      = 8.85*10^-12 *80cos(6.277*10^8t - 2.092y)ax
+//      = 708*10^-12 *cos(6.277*10^8 t -2.092y)ax
+// Displacement current density = ∂D/∂t
+// ∂D/∂t = -708*10^-12*6.277*10^8*sin(6.277*10^8t - 2.092y)ax
+//       = -0.444sin(6.277*10^8t - 2.092y)ax
+mprintf('Amplitude of displacement current density = 0.0444 A/m^2');
+//------------------------------------------------------------------------------