Question: In 1911, Ernest Rutherford modeled an atom as being a point of positive charge Ze surrounded by a negative charge -Ze uniformly distributed in a

In 1911, Ernest Rutherford modeled an atom as being a point of positive charge Ze surrounded by a negative charge -Ze uniformly distributed in a sphere of radius R centered at the point. At distance r within the sphere, the electric potential is

(a) From this formula, determine the magnitude of electric field for 0 ‰¤ r ‰¤ R. What are the
(b) Electric field
(c) Potential for r ‰¥ R?

Ze 1 3

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