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Two cells,Having the same e.m.f., are co...

Two cells,Having the same e.m.f., are connected in series through an external resitance R.Cell have internal resistances `R_(1)` and `R_(2)` `(R_(1)gtR_(2))` respectively.When the circuit is closed,the potential difference across the first cell is zero.The value of R is:-

A

`r_(1) - r_(2) `

B

`(r_(1) + r_(2))/(2)`

C

`(r_(1) + r_(2))/(2)`

D

`r_(1) + r_(2)`

Text Solution

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The correct Answer is:
A
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