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where
V
= 12 V. We attempt to extremize the expression by working through the
dP
/
dR
3
= 0 condition and do not find a value of
R
3
that satisfies it.
(a) We note, then, that the function is a monotonically decreasing function of
R
3
, with
R
3
= 0 giving the maximum possible value (since
R
3
< 0 values are not being allowed).
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 Spring '08
 Any
 Physics, Resistance, Power

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