A 18.6 m long steel beam is accidentally dropped by a construction crane from a height of 8.78 m. The horizontal component of the Earth's magnetic field over the region is 12.7 µT. The acceleration of gravity is 9.8 m/s 2. What is the induced emf in the beam just before impact with the Earth, assuming its long dimension remains in a horizontal plane, oriented perpendicularly to the horizontal component of the Earth's magnetic field? Answer in units of mV
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