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clear
//Given
r=0.53*10**-10 //m
q1=1.6*10**-19 //C
q2=-1.6*10**-19 //C
a=9*10**9
r1=1.06*10**-10
//Calculation
U=a*q1*q2/r
Ue=U/q1
K=-Ue/2.0
E=Ue+K
U1=(a*q1*q2/r1)/q1
//Result
printf("\n (i) Potential energy of the system is %0.1f eV",Ue)
printf("\n (ii) Minimum amount of work required to free the elctrons ia %0.1f ev",E)
printf("\n (iii) Potential energyof the system is %0.1f ev and work requiredto free the electrons is %0.1f eV",E,-E)
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