Resistance $R_1$ is with 10 Ω resistance in series and is in the first gap of meter bridge with $R_2$ in the second gap. The balance point is at 50 cm. When the 10 Ω resistance is removed then the balance point shifts to 40 cm. What is the value of $R_1$?

60 Ω 40 Ω 20 Ω 10 Ω

20 Ω

The correct answer is Option (3) → 20 Ω