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A non-ideal cell with emf (epsilon) and ...

A non-ideal cell with emf (`epsilon`) and internal resistance (r) is connected with an external resistance (R). The efficiency in energy transfer by cell to external resistance is `eta`=`1/3`. Now, an unknown resistance (x) is connected in parallel to the external resistance (R), the new efficiency is `eta`=`1/6`. Then find the ratio of (`(3x)/R`).

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