A cell of constant e.m.f. first connecte...

A cell of constant e.m.f. first connected to a resistance `R_(1)` and then connected to a resistance `R_(2)`. If power delivered in both cases is then the internal resistance o f the cell is

`sqrt(R_(1)R_(2))`

`sqrt((R_(1))/(R_(2)))`

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

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

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