`2A` cell having an emf `epsilon` and internal resistance `r` is connected across a variable external resistance `R`. As the resistance `R` is increased, the plot of potential difference `V` across `R` is given by
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`V = E - Ir = E - V/R r" "(because I = V//R)` or `V(1 + r/R) = E or V= (E)/((1 +r//R))` As R increase V also increase. On ploting a graph between V and R, we get a curve of the type as shown in figure When graph becomes parallel to resistance axis, then, `V = E and R = oo` .
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