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If potentiometer wire of length L and re...

If potentiometer wire of length `L` and resistance `10 Omega` is connected in series with battery of emf `2.5 V` and a resistance in its primary circuit.The null point corresponding to a cell of a emf `1 V` is obtained at a distance `L/2`.If the resistance in the primary circuit is doubled then the position of new null point will be

A

`0.6 L`

B

`0.8 L`

C

`4 L`

D

`0.5 L`

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