Respuesta :

electricpotential V=keQ/r
r = 5.0*10-10 m,
Q = 50e = 50*1.60*10-19
C = 80*10-19 C
V=9.0*109 Nm2C-2* 80*10-19 C / 5.0*10-10

m = 144V

I hope it helped:)