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+//Example 15 // Energy
+clc;
+clear;
+close;
+//given data :
+L=10*10^-3;// in H
+C=20*10^-6;// in F
+n=1/(2*%pi*sqrt(L*C));
+V=10;//in V
+U=(1/2)*C*V^2;
+disp(n,"Frequency,n(cycles/s) = ")
+disp(U,"Energy of oscillations,U(J) = ")
+//answer of frequency is calculated wrong in textbook