The resistance in two arms of the meter ...

The resistance in two arms of the meter bridge is `10 Omega` and x respectively. The balance length is `l_1`from left. Now the resistance of `10 Omega` is shunted with another resistor of resistance equal to unknown resistance x then new balance point is `0.75l_1` The value of resistance x is

`10 Omega`

`30 Omega`

`20 Omega`

`5 Omega`

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