An accumulator with e.m.f. 12 volt and internal resistance 1 2 is connected to a potentiometer wire through resistance 50 2 in series. The potentiometer wire has length 4 m and resistance 9 2. A Leclanche cell can be balanced at 3.2 m length of potentiometer wire. Find the e.m.f. of the a wire of Leclanche cell.
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