AP EAMCET Medical 25 Sep 2020 Shift 1 Paper

An unknown resistance R1 is connected in series with a resistance of 10 Ω. This combination is connected to one gap of a metre bridge while a resistance R2 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 R1 is