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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 resistances of the two sources are `R_1` and `R_2,(R_2 gt R_1)` If the potential difference across the source having internal resistance `R_2` is zero then :

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
D
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