A small charged ball lies within the hollow of a metallic spherical shell of rad

Question

A small charged ball lies within the hollow of a metallic spherical shell of radius R. Here, for three situations, are the net charges on the ball and shell, respectively:

1 +4q, 0
2 -6q, +10q
3 +16q, -12q
(a) Rank the situations according to the charge on the inner surface of the shell, most positive first (use only the symbols > or =, for example 2=3>1).

(b) Rank the situations according to the charge on the outer surface, most positive first (use only the symbols > or =, for example 2=3>1).

Explanation / Answer

a) 2>1>3

b) 3=1=2

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