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Two cells of the same e.mf. e but differ...

Two cells of the same e.mf. e but different internal resistances `r_(1) and r_(2)` are connected in series with an external resistance 'R'. The potential drop across the first cell is found to be zero. The external resistance Ris

A

`r_(1)-r_(2)`

B

`r_(1)/r_(2)`

C

`r_(1)r_(2)`

D

`r_(1)+r_(2)`

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The correct Answer is:
A
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