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An unknown resistance R(1) is connected ...

An unknown resistance `R_(1)` is connected is series with a resistance of `10 Omega`. This combination is connected to one gap of a meter bridge, while other gap is connected to another resistance `R_(2)`. The balance point is at `50 cm` Now , when the `10 Omega` resistance is removed, the balanced point shifts to `40 cm` Then the value of `R_(1)` is.

A

`20 Omega `

B

` 10 Omega `

C

` 60 Omega `

D

` 40 Omega `

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