ch27-p099 - 99. With the unit understood, the equivalent...

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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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