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A light bulb with a resistance of 3.0 2 is connected in series with a variable resistor. A voltage of 9 V is applied

A light bulb with a resistance of 3.0 2 is connected in series with a variable resistor. A voltage of 9 V is applied across the circuit. An ammeter measures that the current in the circuit of 0.5 A. What is the resistance of the variable resistor?

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