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A battery epsilon(1) of 4 V and a variab...

A battery `epsilon_(1)` of 4 V and a variable resistance Rh are connected in series with the wire AB of the potentiometer. The length of the wire of the potentiometer of 1 meter. When a cell `epsilon_(2)` of emf 1.5 V is connected between points A and C, no currents flows through `epsilon_(2)` Length AC=60 cm.
(i) Find the potetial difference between the ends A and B of the potentiometer. (ii) Would the method work, if the battery `epsilon_(1)` is replaced by a cell of emf of 1 V ?

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