COMEDK Exam 2013 Solved Paper

An unknown resistance R1 is connected in series with a resistance of 10Ω. This combination is connected to one gap of a meter bridge, while a resistance R2 is connected in the other gap. The balance point is at 50‌cm. Now, when the 10Ω resistance is removed, the balance point shifts to 40‌cm. The value of R1 (in Ω ) is