electrostatic potential energy is U = k*q1*q2/r
we know that k = 9*10^9 H/m
q1 = charge on proton = 1.6*10^-19 C
q2 = charge on nucleus = 71*1.6*10^-19 C
r = 1.73*10^-15 m
then
U = k*q1*q2/r = (9*10^9*1.6*10^-19*71*1.6*10^-19)/(1.73*10^-15)
U = 9.45*10^-12 J
if it wont works add a negative sign before the answer
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