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+// Calculate V_z
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 2-35 in page 112
+
+clear; clc; close;
+
+// Given data
+// (a) Proof of V_z=51/sigma has been given
+sigmai=1/45; // Intrinsic conductivity in 1/ohm-cm
+sigmap=1/3.9; // Conductivity of p material in1/ohm-cm
+I_0=6*10^-6; // Current in microA
+
+// Calculation
+Vz1=51/sigmai;
+Vz2=51/sigmap;
+I=I_0*(exp(100/26)-1);
+printf("(a)Proof of V_z=51/sigmap has been given\n");
+printf("(b)When material is intrinsic, Vz = %0.3f V\n",Vz1);
+printf("(c)When resistivity drops, Vz = %0.1f V\n",Vz2);
+printf("(d)I = %0.3e A",I);
+
+// Result
+// (a) Vz = 51/sigmap is proved
+// (b) Vz1 = 2300V
+// (c) Vz2 = 198.9V
+// (d) I = 0.274 mA
+\ No newline at end of file