Answer
$V = 0~~$ for $~~r \geq R$
Work Step by Step
When $r \geq R$, we can assume that all the charge is at the center of the sphere.
Since the net charge of the atom is zero, the potential is zero.
$V = 0~~$ for $~~r \geq R$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 40 - All About Atoms - Problems - Page 1251: 79c
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