I have placed an electron at the origin. The grid spacing is 1 Angstrom per small square. Now place an atomic nucleus with 8 protons on positive x-axis, at x = 7.2 Angstroms. How much work did it take you to bring this nucleus in from 1 m away?

Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter43: Nuclear Physics
Section: Chapter Questions
Problem 3P
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I have placed an electron at the origin. The grid spacing is 1 Angstrom per small square. Now place an atomic nucleus with 8 protons on positive x-axis, at x = 7.2 Angstroms. How much work did it take you to bring this nucleus in from 1 m away?
 
   
20.8 eV
   
12.0 eV
   
16.0 eV
   
8.0 eV
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