From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 2720/CH3/EX3.21.5/ex3_21_5.sce | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100755 2720/CH3/EX3.21.5/ex3_21_5.sce

(limited to '2720/CH3/EX3.21.5')

diff --git a/2720/CH3/EX3.21.5/ex3_21_5.sce b/2720/CH3/EX3.21.5/ex3_21_5.sce
new file mode 100755
index 000000000..15a80b592
--- /dev/null
+++ b/2720/CH3/EX3.21.5/ex3_21_5.sce
@@ -0,0 +1,21 @@
+// Exa 3.21.5
+clc;
+clear;
+close;
+format('e',9)
+// Given data
+Mu_n = 0.15;// in m^2/v-s
+K = 1.38 * 10^-23; // in J/K
+T = 300;// in K
+del_n = 10^20;// in per m^3
+Toh_n = 10^-7;// in s
+e = 1.6 * 10^-19;// in C
+D_n = Mu_n * ((K * T)/e);// in m^2/s
+disp(D_n,"The diffusion coefficient in m^2/s is");
+L_n = sqrt(D_n * Toh_n);// in m 
+disp(L_n,"The Diffusion length in m is");
+J_n = (e * D_n * del_n)/L_n;// in A/m^2
+disp(J_n,"The diffusion current density in A/m^2 is"); 
+// Note : The value of diffusion coefficient in the book is wrong.
+
+
-- 
cgit