Question

The lightbulb in the circuit shown here has a resistance of 12 Ω12 ~\Omega and consumes 5.0 W5.0 \mathrm{~W} of power; the rod is 1.25 m1.25 \mathrm{~m} long and moves to the left with a constant speed of 3.1 m/s3.1 \mathrm{~m} / \mathrm{s}. What external force is required to give the rod a speed of 3.49 m/s3.49 \mathrm{~m} / \mathrm{s}, everything else remaining the same?

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