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//Variable declaration
e=1.6*10**-19; //charge of electron(c)
epsilon0=8.85*10**-12; //permittivity(C/Nm)
r0=2.5*10**-10; //seperation(m)
//Calculation
PE=e**2/(4*e*%pi*epsilon0*r0); //potential energy(eV)
//Result
printf('potential energy is %0.3f eV \n',(PE))
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