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Two cells with same e.m.f. .E. and diffe...

Two cells with same e.m.f. .E. and different internal resistances `r_(1)` and `r_(2)` are connected in series to an external resistance .R.. The value of R so that the p.d. across the first cell be zero 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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