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diff --git a/1694/CH6/EX6.12/Ex6_12.sce b/1694/CH6/EX6.12/Ex6_12.sce
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index 000000000..487746d0e
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+++ b/1694/CH6/EX6.12/Ex6_12.sce
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+clear;
+clc;
+printf("\nEx-6.12\n");
+//page no.-189
+//given
+rho=1.42*10^-8;.....//resistivity of wire in ohm m
+E=0.14;.............//electric field in V/m
+n0=6*10^28;.........//no. of electrons per unit vol
+m=9.11*10^-31;......//mass of e in kg
+e=1.6*10^-19;......//charge in C
+
+tau=(m)/no*e^2*rho.........//mean collission time in s
+
+printf("\nmean collission time is 4.236*10^-14 s\n");
+
+v=((e*E)/m)*tau.........//avg drift velocity in m/s
+
+printf("\navg. drift velocity is 1.04*10^-3 m/s");