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Two cells each of emf E and internal res...

Two cells each of emf E and internal resistacne `r_(1)" and "r_(2)` respectively are conneted in series with an external resistance R. The potential defference between the terminats of the first cell will be zero when R equal to

A

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

B

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

C

`r_(1)-r_(2)`

D

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

Text Solution

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The correct Answer is:
C
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