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//variable declaration
I=5; //Ionisation energy
A=4; //Electron Affinity
e=(1.6*10**-19)
E=8.85*10**-12 //epsilon constant
r=0.5*10**-19 //dist between A and B
//Calculations
C=-(e**2/(4*%pi*E*r*e))/10**10 //Coulomb energy
E_c=I-A+C //Energy required
//Result
printf('Coulomb energy =%0.2f eV\n',C)
printf('Energy required =%0.2f eV',E_c')
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