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In a circuit shown in Fig, resistances ...

In a circuit shown in Fig, resistances `R_(1)` and `R_(2)` are known , as well as emf's `xi_(1)` and `xi_(2)`. The internal resitances of the sources are negatible. At what value of the resitance `R` will teh thermal power generated in it be the highest ? What is it equal to ?

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