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+//Example 15.12//
+
+//Using result of sample problem 15.11a and the unit cell geometry of figure 15.22
+Qd=10.56*10^-30;//C m// The tetragonal BaTiO3 unit cell
+V1=0.403*10^-9;//m //length of the tetragonal unit cell
+V2=0.399*10^-9;//m //width of the tetragonal unit cell
+P=Qd/(V1*V2^2)
+mprintf("P = %f C/m^2",P)