the electric potential at the surface of an atomic nucleus(z=50) of radius 9x10^-15m is..
1)9x10^5 v
2) 9 v
3) 8x10^6
4) 80 v

What is the formula to get the electric potential?

You should know your formulae. :rolleyes:

V=E.r
V=w/q
v=kq/r... but still unable to solve..

V = \frac{kQ}{r}

Q = charge of nucleus.
There are 50 protons... so the charge is?

And you know r.

So the charge is? :P

You don't know the charge of a proton? :confused:

from q=ne..

Exactly. Was that so hard? ;)

;d