An electric circuit consists of two emf sources with negligible internal resistance, three resistors, and a voltage meter (V) as represented in the picture above. The voltage meter has infinite resistance and displays the voltage V_ab= V_a - V_b between the points a and b in the circuit. What is the magnitude and direction (towards or away from point b) of the current in the 9.00 ohm resistor ? What is the voltage difference V_ab the voltmeter displays?

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