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Two cells A and B each of 2 V are connec...

Two cells `A` and `B` each of 2 V are connected in series to an external resistance `R=1` ohm.The internal resistance of A is `r_(A)=1.9` ohm and B is `r_(B)=0.9` ohm. Find the potential difference between the terminals of `A`.

Text Solution

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Total current through the circuit, `I = ("voltage")/("Total resistance")`

`=4/(1+1.9 +0.9) = 4/(3.8)A`
Potential difference at A, `V_(A) = e - ir`,
`=2- 4/(3.8) xx 1.9 =2-2=0`
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