In the circuit shown in the figure (A), ...

In the circuit shown in the figure (A), `R_(3)` is a variable resistance

As the value `R_(3)` is changed, current I though the cell varies as shown. Obvioulsy, the variation is asymptotic, i.e. `Irarr6A` as `R_(3)rarroo`. Resistance `R_(1) and R_(2)` are, respectively

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