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+//Example number 7.9, Page number 149
+
+clc;clear;
+close;
+
+//Variable declaration
+C=4*10**-6;    //capacitance(F)
+epsilonr=200;       //relative dielectric constant
+V=2000;       //voltage(V)
+//Calculation
+C0=C/epsilonr;    //energy in condenser(F)
+E=C0*V/2;      //energy in dielectric(J)
+//Result
+printf("energy in condenser is %.e F",C0)
+printf("\n energy in dielectric is %.1e J",E)
+//answer in the book is wrong