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

---
 2288/CH3/EX3.21.21/ex3_21_21.sce | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100755 2288/CH3/EX3.21.21/ex3_21_21.sce

(limited to '2288/CH3/EX3.21.21/ex3_21_21.sce')

diff --git a/2288/CH3/EX3.21.21/ex3_21_21.sce b/2288/CH3/EX3.21.21/ex3_21_21.sce
new file mode 100755
index 000000000..7d8b52f04
--- /dev/null
+++ b/2288/CH3/EX3.21.21/ex3_21_21.sce
@@ -0,0 +1,18 @@
+// Exa 3.21.21
+clc;
+clear;
+close;
+// Given data
+D_n = 25;// in cm^2/sec
+q = 1.6 * 10^-19;// in C
+y2 = 10^14;// in /cm^3
+y1 = 0;// in /cm^3
+x2 = 0;//in  µm
+x1 = 0.5;// in µm
+x1 = x1 * 10^-4;// in cm
+dnBYdx = abs((y2-y1)/(x2-x1));// in /cm^4 
+J_n = q * D_n * (dnBYdx);// in /cm^4
+J_n = J_n * 10^-1;// in A/cm^2
+disp(J_n,"The collector current density in A/cm^2 is");
+
+// Note: In the book, the calculated value of dn by dx (2*10^19) is wrong. Correct value is 2*10^18 so the answer in the book is wrong.
-- 
cgit