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+// Exa 2.21
+clc;
+clear;
+close;
+format('v',6)
+// Given data
+R_F = 0.01;
+Vdc = 30;// in V
+R_L = 1;// in  k ohm
+R_L = R_L * 10^3;// in ohm
+Idc = Vdc/R_L;// in A
+Idc = Idc * 10^3;// in mA
+// Vdc = Vm-( (5000*Idc)/C );
+Gamma = 0.01;// ripple factor
+//Gamma = 2900/(C*R_L);
+C = 2900/(Gamma*R_L);// in F
+Vm = Vdc + ((5000*Idc*10^-3)/C);// in V
+// The input voltage required 
+V2 = (2*Vm)/sqrt(2);// in V 
+disp(V2,"The input voltage required in V is");
+
+//Note: The value of Vm in the book is not accurate, So the answer in the book is wrong.