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A cell of internal resistances r is conn...

A cell of internal resistances `r` is connected to a load of resistance `R` . Energy is dissipated in the load, but some thermal energy is also wasted in the cell. The efficiency of such an arrangement is found from the expression
( Energy dissipated in the load )/( Energy dissipated in the complete circuit)
Which of the following gives the efficiency in this case?

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