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to include in the computation can only lower the result (that is, make the result more
negative).
(c) The observation in the previous part implies that the work I do in removing sphere
A
(to obtain the case considered in part (a)) must lead to an increase in the system energy;
thus, I do positive work.
(d) To put sphere
A
back in, I do negative work, since I am causing the system energy to
become more negative.
78. (a) We note that
r
C
(the distance from the origin to sphere
C
, which is the same as the
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 Spring '08
 Any
 Physics, Energy, Potential Energy

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