An aluminum bar moves with a speed 4.25m/s between two copper roads in a magnetic field of 0.1T as indicated on the figure. The distance between the cooper roads is 0.3m. The aluminum bar is always in contact with cooper roads and moves without friction. A resistor with a resistance of 7ohm is coupled between the roads.  Consider that the resistance of the copper rods and aluminum bar are zero ohms? What is the power dissipated by the resistor in Watt?

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