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A circuit shown in Fig, has resistances...

A circuit shown in Fig, has resistances `R_(1) = 20 Omega` and `R_(2) = 30 Omega`. At what value of the resitanace `R_(x)` will the thermal power generated in it practically independent of small variations of that resistance? The voltage between the points `A` and `B` is supposed to be constant in this case

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