Physics (AS & A Level) · Oct / Nov 2017 · Paper 13 · Question 36
Two cells, each with electromotive force (e.m.f.) E, but different internal resistances r₁ and r₂, are connected in series to a resistor R. The reading on the voltmeter is 0 V. What is the resistance of R?
- A0
- Br1 - r2
- Cr1 + r2
- D\frac{r_1 r_2}{r_1 + r_2}
As printed in the paper
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Correct answer: B. r1 - r2
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