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Two cells, having the same emf, are conn...

Two cells, having the same emf, are connected in series through an external resistance `R`. Cells have internal resistance `r_(1)` and `r_(2) (r_(1) gt r_(2))` respectively. When the circuit is closed, the potentail difference across the first cell is zero the value of `R` is

A

`sqrt(r_(1)r_(2))`

B

`r_(1)+r_(2)`

C

`r_(1)-r_(2)`

D

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

Text Solution

Verified by Experts

The correct Answer is:
C
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