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diff --git a/3523/CH3/EX3.7.17/Ex3_17.sce b/3523/CH3/EX3.7.17/Ex3_17.sce
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+//Example 17// Ch 3
+clc;
+clear;
+close;
+// given data
+E = 5; //electric field in V/m
+n_o = 10^11; //ion density in ions/m3
+T = 293; // in kelvin
+z = 0.02; //distance in meters
+e = 1.6*10^-19; //in couloumb
+k = 1.38*10^-23; // in m2 kg s-2 K-1
+n1 = n_o*exp((-e*E*z)/(k*T));//ion density 0.02m away
+n2 = n_o*exp((e*E*z)/(k*T));//ion density -0.02m away
+printf("ion density 0.02m away %e ions/m^3 \n",n1)
+printf("ion density -0.02m away %e ions/m^3 \n",n2)