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A potentiometer PQ is set up to comapre ...

A potentiometer PQ is set up to comapre two resistances as shown in the figure. The ammeter A in the circuit reads 1.0 A when two way key `K_(3)` is open. The balance point is at a length `l_(2)` cm from P when two way key `K_(3)` is plugged in between 2 and 1, while the balance point is at a length `l_(2)` cm from P when key `K_(3)` is plugged in between 3 and 1. The ratio of the two resistance `(R_(1))/(R_(2))`, is found to be-

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