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A 0.392 m long metal bar is pulled to the left by an force F ....

A 0.392 m long metal bar is pulled to the left by an force F . The bar rides on parallel metal rails connected through a 48.4 Ω resistor, as shown in the following figure(Figure 1), so the apparatus makes a complete circuit. You can ignore the resistance of the bar and rails. The circuit is in a uniform 0.638 T magnetic field that is directed out of the plane of the figure. At the instant when the bar is moving to the left at 5.90 m/s , what is the rate at which the applied force is doing work on the bar?

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The rate at which the applied force doing work is 7.63 mW

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