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+//Page Number: 488
+//Example 9.15
+clc;
+//Given
+L=10D-6; //m
+f=10D+9; //Hz
+e=1.6D-19;
+n0=2D+20; //m3
+E=3200D+2; //V/m
+
+//Current density
+vd=L*f;
+J=n0*e*vd;
+disp('A/m sqr',J,'Current density:');
+
+//Negative electron mobility
+mu=-vd/E;
+disp('cm sqr/Vs',mu*10000,'Negative electron mobility:');
+
+//Answer for Negative electron mobility is 3125 but it is given as 3100
+