Potential energy of electrom present in `He^(+)` is :
A
`(e^(2))/(2 piepsi_(0)r)`
B
`(3e^(2))/(4 piepsi_(0)r)`
C
`(-2e^(2))/(4 piepsi_(0)r)`
D
`(-e^(2))/(4 piepsi_(0)r^(2))`
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