A simple potentiometer circuit is shown ...

A simple potentiometer circuit is shown in the figure. The internal resistance of 5 V battery is `0.6 Omega` wire of length `4 m` and resistance `0.5 Omega` per meter. The length AB for which galvanometer shows zero deflection is

`180 cm`

`300 cm`

`260 cm`

`200 cm`

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