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One of the circuits for the measurement ...

One of the circuits for the measurement of resistance by potentiometer is shown. The galvanometer is connected at point `A` and zero deflection is observed is observed at length `PJ = 30 cm`. In second case the secondary cell is changed.

Take `E_(s) = 10 V` and `r = 1 Omega` in `1^(st)` reading and `E_(s) = 5 V` and `r = 2 Omega` in `2^(nd)` reading. In second case, the zero deflection is observed at length `PJ = 10 cm`. What is the resistance `R` (in ohm)?

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