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+// Exa 3.2
+clc;
+clear;
+close;
+// Given data
+toh= 10^-6;// in sec
+I=10;// in mA
+I=I*10^-3;// in A
+n=1;
+V_T= 26;// in mV
+V_T= V_T*10^-3;// in V
+C_D= toh*I/(n*V_T);// in F
+disp(C_D*10^9,"The diffusion capacitance in p-n junction diode in nF")
+
+// Note: There are two mistake in the book. First one is this that they put the wrong value of I to evaluating the value of C_D because the value of I is given 10mA (i.e. 10*10^-3= 10^-2 amp) but they put 10^-3 at place 
+//          of 10^-2 and second one is calculation error. So the answer in the book is wrong.