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An unknown resistance *R*_{1} is connected in series with a resistance of 10 Ω. This combinations is connected to one gap of a metre bridge while a resistance *R*_{2} is connected in the other gap. The balance point is at 50 *cm*. Now, when the 10 Ω resistance is removed the balance point shifts to 40 *cm*. The value of *R*_{1} is (in *ohm*)

(1) 60

(2) 40

(3) 20

(4) 10