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Two sources of equal emf are connected t...

Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are` R_(1) and R_(2) (R_(1) gt R_(1))`. If the potential difference across the source having internal resistance `R_(2)` is zero, then

A

`R=(R_(2)xx(R_(1)+R_(2)))/((R_(2)-R_(1)))`

B

`R=R_(2)-R_(1)`

C

`R=(R_(1)R_(2))/((R_(2)+R_(1)))`

D

`R=(R_(1)R_(2))/((R_(2)-R_(1)))`

Text Solution

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The correct Answer is:
B
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