The light bulb in the circuit shown has a resistance of 12, Ask an Expert

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The light bulb in the circuit shown has a resistance of 12 Ω and consumes 5 watts of power; the rod is 1.25 m long and moves to the left with a constant speed of 3.1 m/s.

120_The light bulb in the circuit shown has a resistanc.png

(a) What is the strength of the magnetic field?

(b) What external force is required to maintain the rod's constant speed?

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