ch27-p021 - 21. To be as general as possible, we refer to...

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21. To be as general as possible, we refer to the individual emf’s as ε 1 and 2 and wait until the latter steps to equate them ( 1 = 2 = ). The batteries are placed in series in such a way that their voltages add; that is, they do not “oppose” each other. The total resistance in the circuit is therefore R total = R + r 1 + r 2 (where the problem tells us r 1 > r 2 ), and the “net emf” in the circuit is 1 + 2 . Since battery 1 has the higher internal resistance, it is the one capable of having a zero terminal voltage, as the computation in part (a)
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