The nucleus of an atom contains 29 protons and has a radius of 4.8 x 10-15 m. How much work (in electron volts) is done by the electric force as a proton is brought from infinity, where it is at rest, to the "surface" of this nucleus?
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The potential energy at the surface is kq1*q2/r, so that's the amount of work done in coming from infinity to the surface.
k is the Coulomb constant (I'm sure it's in your book), q1 and q2 are the charge of the nucleus and the proton, in Coulombs, r is the radius. Plug in the numbers.
k is the Coulomb constant (I'm sure it's in your book), q1 and q2 are the charge of the nucleus and the proton, in Coulombs, r is the radius. Plug in the numbers.