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 toA. `(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))`

Two cells each of emf E and internal resistacne `r_(1)" and "r_(2)` re

1.	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 toA. `(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))`
Answer» Correct Answer - C

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