An unknown resistance R1 is connected in series with resistance 10 Ω. When the combination is connected in left gap of a metre bridge and R2 is connected in right gap, the balance point from left end is at 50 cm. When the 10 Ω is removed, the balance point from left end becomes 40 cm. The value of R1 is

An unknown resistance R1 is connected in series with resistance 10 Ω.

1.	An unknown resistance R1 is connected in series with resistance 10 Ω. When the combination is connected in left gap of a metre bridge and R2 is connected in right gap, the balance point from left end is at 50 cm. When the 10 Ω is removed, the balance point from left end becomes 40 cm. The value of R1 is
Answer» An unknown resistance $R_{1}$ is connected in series with resistance $10 Ω$ . When the combination is connected in left gap of a metre bridge and $R_{2}$ is connected in right gap, the balance point from left end is at $50 cm$ . When the $10 Ω$ is removed, the balance point from left end becomes $40 cm$ . The value of $R_{1}$ is

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