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+//Example 3_18 page no:225
+clc;
+//given
+len = 0.3;//in m
+wide = 0.15;//in m
+thick = 0.025;//in m
+temp = 160;//in C
+t = 10;//in minutes
+frequency = 30//in MHz
+spc_heat = 1465;//in Jkg^-1C^-1
+weight = 575;//in kgm^-3
+permitivity = 5;
+power_factor = 0.05;
+vol_of_wood = len * wide * thick;
+weight_of_wood = vol_of_wood * weight;
+heat_req = weight_of_wood * spc_heat * 150;
+heat_req = heat_req/(3.6*10^3);//converting to Wh
+pow_req = heat_req * 60/t;
+disp(pow_req,"the power required is (in W)");
+c = (len * wide * permitivity * 1.113 * 10 ^ -10)/(4*%pi * thick);
+cap_reactance = 1/ ( 2*%pi* frequency * 10 ^6 * c);
+phi = acosd(0.05);
+R = cap_reactance * tand(phi);
+V= sqrt(290*R);
+disp(V,"the voltage across the work is (in V)");
+I = V/cap_reactance;
+disp(I,"the current in the work is (in A)");
+//the result vary with textbook hence capacitive reactance value is greatly rounded off which change result of resistance so voltage vary with textbook
+