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The internal resistance of a cell of emf...

The internal resistance of a cell of `emf E` is r, and external resistance is R. What is the potential about the external Resistance

A

`V=E/{(1+(r/R)^2}`

B

`V=E/(1+(r/R))`

C

`V=E/(1+(R/r))`

D

`overset(E^+)IR`

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