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Two cells of same emf E but internal res...


Two cells of same emf E but internal resistance `r_(1) and r_(2)` are connected in series to an external resistor R(figure). What should be the value of R so that the potential difference across the terminals of the first cell becomes zero?

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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