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The electric potential at the surface of...

The electric potential at the surface of an atomic nucleus (Z = 50) of radius `9 xx 10^-15 m` is

A

`4 xx 10^6 V`

B

`8 xx 10^6 V`

C

`4 xx 10^-6 V`

D

`8 xx 10^-6 V`

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