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A circuit consists of two resistors with resistances R1 = 6.0! and R2 =1.5!, a variable resistor, the resistance Rvar of which can be adjusted, a resistor of unknown value Ru , and 9.0 volt battery connected as shown in the figure. When Rvar is adjusted to 12 ohms, there is zero current through the ammeter. What is the unknown resistance Ru ?  

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