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+//in page no.340,numbering is done wrongly,it should be like ex-8,ex-9,ex-10,ex-11,ex-12,ex-13,ex-14
+clc
+//to calculate average values of intensities of electric and magnetic fields of radiation
+//energy of lamp=1000 J/s
+//area illuminated =4*%pi*r^2=16*%pi m^2
+//energy radiated per unit area per second =1000/16*%pi
+//from poynting theorem |s|=|E*H|=E*H           eq(1)
+s=1000/(16*%pi)
+muo=4*%pi*10^-7             //permeability of free space
+epsilon0=8.85*10^-12              //permittivity in free space
+//E/H=sqrt(muo/epsilon0)        eq(2)
+//from eq(1) and eq(2),we get
+E=sqrt(s*sqrt(muo/epsilon0))
+H=s/E
+disp("average value of intensity of electric fields of radiation is E="+string(E)+"V/m")
+disp("average value of intensity of magnetic fields of radiation is H="+string(H)+"ampere-turn/m")
+//answer is given wrong in the book E=48.87 V/m,solution of magnetic fields is not given in the book .