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A potentiometer wire is 100 cm long and ...

A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells of emfs `epsi_(1) and epsi_(2)` are connected in series first to support one another and then in opposition. The balance points were obtaind at 60 cm and 12 cm from the same end of the wire in the two cases. find the ratio of the emfs.

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